Bug 734668; remove some more canvas stuff; r=Ms2ger

--HG--
extra : rebase_source : 3950da41e60016c08c6eeb8ea4e8394335091471

dom/base/nsDOMClassInfo.cpp

@@ -4546,9 +4546,6 @@ nsDOMClassInfo::Init()
   // overwrite some values.
   mozilla::dom::oldproxybindings::Register(nameSpaceManager);
 
-  nameSpaceManager->RegisterDefineDOMInterface(NS_LITERAL_STRING("CanvasRenderingContext2D"),
-                                               nullptr, nullptr);
-
   sIsInitialized = true;
 
   return NS_OK;