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

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

Index: Source/bindings/core/v8/custom/V8WindowCustom.cpp
diff --git a/Source/bindings/core/v8/custom/V8WindowCustom.cpp b/Source/bindings/core/v8/custom/V8WindowCustom.cpp
index 18fa0f9846b509a19ce6d5f54c0e2cd3282e84b1..c4e75c2e34a3c8d10530f8ae8ed9e5a3b2bfca57 100644
--- a/Source/bindings/core/v8/custom/V8WindowCustom.cpp
+++ b/Source/bindings/core/v8/custom/V8WindowCustom.cpp
@@ -300,9 +300,6 @@ static bool installTestInterfaceIfNeeded(LocalFrame& frame, v8::Local<v8::String
 
 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)
@@ -324,16 +321,6 @@ void V8Window::namedPropertyGetterCustom(v8::Local<v8::Name> name, const v8::Pro
         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;