v8binding: Makes ToV8(window) work without a frame.

third_party/WebKit/Source/bindings/core/v8/ToV8ForCore.cpp

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/core/v8/ToV8ForCore.h"
 
 #include "bindings/core/v8/WindowProxy.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindow.h"
 #include "core/frame/Frame.h"
 
 namespace blink {
 
 v8::Local<v8::Value> ToV8(DOMWindow* window,
                           v8::Local<v8::Object> creation_context,
                           v8::Isolate* isolate) {
   // Notice that we explicitly ignore creationContext because the DOMWindow
   // has its own creationContext.
 
   if (UNLIKELY(!window))
     return v8::Null(isolate);
-  // Initializes environment of a frame, and return the global object
-  // of the frame.
-  Frame* frame = window->GetFrame();
-  if (!frame)
-    return V8Undefined();
 
-  return frame->GetWindowProxy(DOMWrapperWorld::Current(isolate))
-      ->GlobalProxyIfNotDetached();
+  return window->GlobalProxy(DOMWrapperWorld::Current(isolate));
 }
 
 v8::Local<v8::Value> ToV8(EventTarget* impl,
                           v8::Local<v8::Object> creation_context,
                           v8::Isolate* isolate) {
   if (UNLIKELY(!impl))
     return v8::Null(isolate);
 
   if (impl->InterfaceName() == EventTargetNames::DOMWindow)
     return ToV8(static_cast<DOMWindow*>(impl), creation_context, isolate);
   return ToV8(static_cast<ScriptWrappable*>(impl), creation_context, isolate);
 }
 
 }  // namespace blink