Bug 1163865 - Remove [Throws] from FontFaceSet.delete. r=smaug

dom/webidl/FontFaceSet.webidl

@@ -36,7 +36,7 @@ interface FontFaceSet : EventTarget {
   readonly attribute unsigned long size;
   [Throws] void add(FontFace font);
   boolean has(FontFace font);
-  [Throws] boolean delete(FontFace font);
+  boolean delete(FontFace font);
   void clear();
   [NewObject] FontFaceSetIterator entries();
   // Iterator keys();

layout/style/FontFaceSet.cpp

@@ -275,7 +275,7 @@ FontFaceSet::Clear()
 }
 
 bool
-FontFaceSet::Delete(FontFace& aFontFace, ErrorResult& aRv)
+FontFaceSet::Delete(FontFace& aFontFace)
 {
   mPresContext->FlushUserFontSet();
 

layout/style/FontFaceSet.h

@@ -175,7 +175,7 @@ public:
 
   FontFaceSet* Add(FontFace& aFontFace, mozilla::ErrorResult& aRv);
   void Clear();
-  bool Delete(FontFace& aFontFace, mozilla::ErrorResult& aRv);
+  bool Delete(FontFace& aFontFace);
   bool Has(FontFace& aFontFace);
   uint32_t Size();
   mozilla::dom::FontFaceSetIterator* Entries();