bindings: Uses V8's named property interceptor for Window.

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 282 matching lines @@
         v8CallOrCrash(interfacesMap->Set(context, name, interface));
         v8SetReturnValue(info, interface);
         return true;
     }
 
     return false;
 }
 
 void V8Window::namedPropertyGetterCustom(v8::Local<v8::Name> name, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
-    if (!name->IsString())
-        return;
-
     auto nameString = name.As<v8::String>();
     DOMWindow* window = V8Window::toImpl(info.Holder());
     if (!window)
         return;
 
     Frame* frame = window->frame();
     // window is detached from a frame.
     if (!frame)
         return;
 
     AtomicString propName = toCoreAtomicString(nameString);
 
     // Note that the spec doesn't allow any cross-origin named access to the window object. However,
     // UAs have traditionally allowed named access to named child browsing contexts, even across
     // origins. So first, search child frames for a frame with a matching name.
     Frame* child = frame->tree().scopedChild(propName);
     if (child) {
         v8SetReturnValueFast(info, child->domWindow(), window);
         return;
     }
 
-    // Search IDL functions defined in the prototype
-    if (!info.Holder()->GetRealNamedProperty(info.GetIsolate()->GetCurrentContext(), nameString).IsEmpty())
-        return;
-
-    // Frame could have been detached in call to GetRealNamedProperty.
-    frame = window->frame();
-    // window is detached.
-    if (!frame)
-        return;
-
     // If the frame is remote, the caller will never be able to access further named results.
     if (!frame->isLocalFrame())
         return;
 
     if (installTestInterfaceIfNeeded(toLocalFrame(*frame), nameString, info))
         return;
 
     // Search named items in the document.
     Document* doc = toLocalFrame(frame)->document();
     if (!doc || !doc->isHTMLDocument())
@@ skipping 55 matching lines @@
 {
     return securityCheck(host);
 }
 
 bool V8Window::indexedSecurityCheckCustom(v8::Local<v8::Object> host, uint32_t index, v8::AccessType type, v8::Local<v8::Value>)
 {
     return securityCheck(host);
 }
 
 } // namespace blink