Bug 1193762 part 6 - Return raw pointer, not nsCOMPtr; r=froydnj

This could alternatively have been fixed by changing
AccessibleCaret::CaretElement to return an nsCOMPtr instead of a raw
pointer, but I chose to change this in the other direction instead, to
match the accepted convention.

dom/base/AnonymousContent.cpp

@@ -29,7 +29,7 @@ AnonymousContent::~AnonymousContent()
 {
 }
 
-nsCOMPtr<Element>
+Element*
 AnonymousContent::GetContentNode()
 {
   return mContentNode;

dom/base/AnonymousContent.h

@@ -25,7 +25,7 @@ public:
   NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(AnonymousContent)
 
   explicit AnonymousContent(Element* aContentNode);
-  nsCOMPtr<Element> GetContentNode();
+  Element* GetContentNode();
   void SetContentNode(Element* aContentNode);
   bool WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto, JS::MutableHandle<JSObject*> aReflector);