Bug 852501 part 16. Make ConstructFrame infallible. r=dholbert

layout/base/nsCSSFrameConstructor.cpp

@@ -4964,7 +4964,7 @@ nsCSSFrameConstructor::AddPageBreakItem(nsIContent* aContent,
                     kNameSpaceID_None, nullptr, pseudoStyle.forget(), true);
 }
 
-nsresult
+void
 nsCSSFrameConstructor::ConstructFrame(nsFrameConstructorState& aState,
                                       nsIContent*              aContent,
                                       nsIFrame*                aParentFrame,
@@ -4993,8 +4993,6 @@ nsCSSFrameConstructor::ConstructFrame(nsFrameConstructorState& aState,
                  "This is not going to work");
     ConstructFramesFromItem(aState, iter, aParentFrame, aFrameItems);
   }
-
-  return NS_OK;
 }
 
 void

layout/base/nsCSSFrameConstructor.h

@@ -422,7 +422,7 @@ private:
   // Construct a frame for aContent and put it in aFrameItems.  This should
   // only be used in cases when it's known that the frame won't need table
   // pseudo-frame construction and the like.
-  nsresult ConstructFrame(nsFrameConstructorState& aState,
+  void ConstructFrame(nsFrameConstructorState& aState,
                       nsIContent*              aContent,
                       nsIFrame*                aParentFrame,
                       nsFrameItems&            aFrameItems);