Revert r174506

Source/bindings/core/v8/custom/V8WindowCustom.cpp

 /*
  * Copyright (C) 2009, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 139 matching lines @@
 
 void V8Window::eventAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     LocalFrame* frame = V8Window::toNative(info.Holder())->frame();
     ExceptionState exceptionState(ExceptionState::GetterContext, "event", "Window", info.Holder(), info.GetIsolate());
     if (!BindingSecurity::shouldAllowAccessToFrame(info.GetIsolate(), frame, exceptionState)) {
         exceptionState.throwIfNeeded();
         return;
     }
 
-    v8::Handle<v8::Value> jsEvent = V8HiddenValue::getHiddenValue(info.GetIsolate(), info.Holder()->CreationContext()->Global(), V8HiddenValue::event(info.GetIsolate()));
+    ASSERT(frame);
+    // This is a fast path to retrieve info.Holder()->CreationContext().
+    v8::Local<v8::Context> context = toV8Context(frame, DOMWrapperWorld::current(info.GetIsolate()));
+    if (context.IsEmpty())
+        return;
+
+    v8::Handle<v8::Value> jsEvent = V8HiddenValue::getHiddenValue(info.GetIsolate(), context->Global(), V8HiddenValue::event(info.GetIsolate()));
     if (jsEvent.IsEmpty())
         return;
     v8SetReturnValue(info, jsEvent);
 }
 
 void V8Window::eventAttributeSetterCustom(v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info)
 {
     LocalFrame* frame = V8Window::toNative(info.Holder())->frame();
     ExceptionState exceptionState(ExceptionState::SetterContext, "event", "Window", info.Holder(), info.GetIsolate());
     if (!BindingSecurity::shouldAllowAccessToFrame(info.GetIsolate(), frame, exceptionState)) {
         exceptionState.throwIfNeeded();
         return;
     }
 
-    V8HiddenValue::setHiddenValue(info.GetIsolate(), info.Holder()->CreationContext()->Global(), V8HiddenValue::event(info.GetIsolate()), value);
+    ASSERT(frame);
+    // This is a fast path to retrieve info.Holder()->CreationContext().
+    v8::Local<v8::Context> context = toV8Context(frame, DOMWrapperWorld::current(info.GetIsolate()));
+    if (context.IsEmpty())
+        return;
+
+    V8HiddenValue::setHiddenValue(info.GetIsolate(), context->Global(), V8HiddenValue::event(info.GetIsolate()), value);
 }
 
 void V8Window::frameElementAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     LocalDOMWindow* impl = V8Window::toNative(info.Holder());
     ExceptionState exceptionState(ExceptionState::GetterContext, "frame", "Window", info.Holder(), info.GetIsolate());
     if (!BindingSecurity::shouldAllowAccessToNode(info.GetIsolate(), impl->frameElement(), exceptionState)) {
         v8SetReturnValueNull(info);
         exceptionState.throwIfNeeded();
         return;
@@ skipping 346 matching lines @@
     v8::Handle<v8::Context> context = toV8Context(frame, DOMWrapperWorld::current(isolate));
     if (context.IsEmpty())
         return v8Undefined();
 
     v8::Handle<v8::Object> global = context->Global();
     ASSERT(!global.IsEmpty());
     return global;
 }
 
 } // namespace blink