bindings: Retires manual dispatching in createV8{HTML,SVG}Wrapper, etc.

Source/core/events/MessageEvent.cpp

Index: Source/core/events/MessageEvent.cpp
diff --git a/Source/core/events/MessageEvent.cpp b/Source/core/events/MessageEvent.cpp
index 1eb630a05bcf6fe2b549eb3c8f0518ec05ff2880..67465a1981fb995fef00b09090cf8fd3a33a43cf 100644
--- a/Source/core/events/MessageEvent.cpp
+++ b/Source/core/events/MessageEvent.cpp
@@ -199,6 +199,9 @@ v8::Handle<v8::Object> MessageEvent::wrap(v8::Handle<v8::Object> creationContext
 {
     v8::Handle<v8::Object> wrapper = Event::wrap(creationContext, isolate);
 
+    // Ensures a wrapper is created for the data to return now so that V8 knows how
+    // much memory is used via the wrapper. To keep the wrapper alive, it's set to
+    // the wrapper of the MessageEvent as a hidden value.
     switch (dataType()) {
     case MessageEvent::DataTypeScriptValue:
     case MessageEvent::DataTypeSerializedScriptValue: