bindings: Simplifies WindowProxyManager and its relation to Frame.

third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 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 962 matching lines @@
     addHiddenValueToArray(isolate, object, newValue, arrayIndex);
 }
 
 v8::Isolate* toIsolate(ExecutionContext* context) {
   if (context && context->isDocument())
     return V8PerIsolateData::mainThreadIsolate();
   return v8::Isolate::GetCurrent();
 }
 
 v8::Isolate* toIsolate(LocalFrame* frame) {
-  ASSERT(frame);
-  return frame->script().isolate();
+  DCHECK(frame);
+  return frame->getWindowProxyManager()->isolate();
 }
 
 v8::Local<v8::Value> freezeV8Object(v8::Local<v8::Value> value,
                                     v8::Isolate* isolate) {
   value.As<v8::Object>()
       ->SetIntegrityLevel(isolate->GetCurrentContext(),
                           v8::IntegrityLevel::kFrozen)
       .ToChecked();
   return value;
 }
 
 v8::Local<v8::Value> fromJSONString(v8::Isolate* isolate,
                                     const String& stringifiedJSON,
                                     ExceptionState& exceptionState) {
   v8::Local<v8::Value> parsed;
   v8::TryCatch tryCatch(isolate);
   if (!v8Call(v8::JSON::Parse(isolate, v8String(isolate, stringifiedJSON)),
               parsed, tryCatch)) {
     if (tryCatch.HasCaught())
       exceptionState.rethrowV8Exception(tryCatch.Exception());
   }
 
   return parsed;
 }
 
 }  // namespace blink