diff --git a/layout/style/nsStyleStruct.h b/layout/style/nsStyleStruct.h
index 8bba4e0037e3..ecb9d6b45154 100644
--- a/layout/style/nsStyleStruct.h
+++ b/layout/style/nsStyleStruct.h
@@ -180,7 +180,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleFont
   static nscoord UnZoomText(nsPresContext* aPresContext, nscoord aSize);
   static already_AddRefed<nsIAtom> GetLanguage(StyleStructContext aPresContext);
 
-  void* operator new(size_t sz, nsStyleFont* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleFont* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleFont, sz);
@@ -454,7 +454,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleColor
     return nsChangeHint(0);
   }
 
-  void* operator new(size_t sz, nsStyleColor* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleColor* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleColor, sz);
@@ -823,7 +823,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleBackground {
   nsStyleBackground(const nsStyleBackground& aOther);
   ~nsStyleBackground();
 
-  void* operator new(size_t sz, nsStyleBackground* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleBackground* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleBackground, sz);
@@ -883,7 +883,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleMargin
     MOZ_COUNT_DTOR(nsStyleMargin);
   }
 
-  void* operator new(size_t sz, nsStyleMargin* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleMargin* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleMargin, sz);
@@ -930,7 +930,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStylePadding
     MOZ_COUNT_DTOR(nsStylePadding);
   }
 
-  void* operator new(size_t sz, nsStylePadding* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStylePadding* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStylePadding, sz);
@@ -1137,7 +1137,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleBorder
   nsStyleBorder(const nsStyleBorder& aBorder);
   ~nsStyleBorder();
 
-  void* operator new(size_t sz, nsStyleBorder* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleBorder* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleBorder, sz);
@@ -1370,7 +1370,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleOutline
     MOZ_COUNT_DTOR(nsStyleOutline);
   }
 
-  void* operator new(size_t sz, nsStyleOutline* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleOutline* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleOutline, sz);
@@ -1483,7 +1483,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleList
   nsStyleList(const nsStyleList& aStyleList);
   ~nsStyleList();
 
-  void* operator new(size_t sz, nsStyleList* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleList* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleList, sz);
@@ -1710,7 +1710,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStylePosition
   nsStylePosition(const nsStylePosition& aOther);
   ~nsStylePosition();
 
-  void* operator new(size_t sz, nsStylePosition* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStylePosition* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStylePosition, sz);
@@ -1961,7 +1961,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleTextReset
   nsStyleTextReset(const nsStyleTextReset& aOther);
   ~nsStyleTextReset();
 
-  void* operator new(size_t sz, nsStyleTextReset* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleTextReset* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleTextReset, sz);
@@ -2048,7 +2048,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleText
   nsStyleText(const nsStyleText& aOther);
   ~nsStyleText();
 
-  void* operator new(size_t sz, nsStyleText* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleText* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleText, sz);
@@ -2269,7 +2269,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleVisibility
     MOZ_COUNT_DTOR(nsStyleVisibility);
   }
 
-  void* operator new(size_t sz, nsStyleVisibility* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleVisibility* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleVisibility, sz);
@@ -2786,7 +2786,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleDisplay
     MOZ_COUNT_DTOR(nsStyleDisplay);
   }
 
-  void* operator new(size_t sz, nsStyleDisplay* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleDisplay* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleDisplay, sz);
@@ -3064,7 +3064,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleTable
   nsStyleTable(const nsStyleTable& aOther);
   ~nsStyleTable();
 
-  void* operator new(size_t sz, nsStyleTable* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleTable* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleTable, sz);
@@ -3095,7 +3095,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleTableBorder
   nsStyleTableBorder(const nsStyleTableBorder& aOther);
   ~nsStyleTableBorder();
 
-  void* operator new(size_t sz, nsStyleTableBorder* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleTableBorder* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleTableBorder, sz);
@@ -3196,7 +3196,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleContent
   nsStyleContent(const nsStyleContent& aContent);
   ~nsStyleContent();
 
-  void* operator new(size_t sz, nsStyleContent* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleContent* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleContent, sz);
@@ -3308,7 +3308,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleUIReset
   nsStyleUIReset(const nsStyleUIReset& aOther);
   ~nsStyleUIReset();
 
-  void* operator new(size_t sz, nsStyleUIReset* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleUIReset* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleUIReset, sz);
@@ -3377,7 +3377,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleUserInterface
   nsStyleUserInterface(const nsStyleUserInterface& aOther);
   ~nsStyleUserInterface();
 
-  void* operator new(size_t sz, nsStyleUserInterface* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleUserInterface* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleUserInterface, sz);
@@ -3429,7 +3429,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleXUL
   nsStyleXUL(const nsStyleXUL& aSource);
   ~nsStyleXUL();
 
-  void* operator new(size_t sz, nsStyleXUL* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleXUL* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleXUL, sz);
@@ -3468,7 +3468,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleColumn
   nsStyleColumn(const nsStyleColumn& aSource);
   ~nsStyleColumn();
 
-  void* operator new(size_t sz, nsStyleColumn* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleColumn* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleColumn, sz);
@@ -3566,7 +3566,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleSVG
   nsStyleSVG(const nsStyleSVG& aSource);
   ~nsStyleSVG();
 
-  void* operator new(size_t sz, nsStyleSVG* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleSVG* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleSVG, sz);
@@ -3757,7 +3757,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleSVGReset
   nsStyleSVGReset(const nsStyleSVGReset& aSource);
   ~nsStyleSVGReset();
 
-  void* operator new(size_t sz, nsStyleSVGReset* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleSVGReset* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleSVGReset, sz);
@@ -3808,7 +3808,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleVariables
   nsStyleVariables(const nsStyleVariables& aSource);
   ~nsStyleVariables();
 
-  void* operator new(size_t sz, nsStyleVariables* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleVariables* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleVariables, sz);
@@ -3838,7 +3838,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleEffects
   nsStyleEffects(const nsStyleEffects& aSource);
   ~nsStyleEffects();
 
-  void* operator new(size_t sz, nsStyleEffects* aSelf) CPP_THROW_NEW { return aSelf; }
+  void* operator new(size_t sz, nsStyleEffects* aSelf) { return aSelf; }
   void* operator new(size_t sz, nsPresContext* aContext) {
     return aContext->PresShell()->
       AllocateByObjectID(mozilla::eArenaObjectID_nsStyleEffects, sz);