Move MainWorldScriptContext accessor/method from WebFrame to WebLocalFrame.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

Index: third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
index aae2a4031d6f21285591bfc8cdc417d4cf06f115..9ed6926474065df046de763dd845d0611404ef00 100644
--- a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
+++ b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
@@ -843,6 +843,10 @@ v8::Local<v8::Context> WebLocalFrameImpl::MainWorldScriptContext() const {
   return script_state->GetContext();
 }
 
+v8::Local<v8::Object> WebLocalFrameImpl::GlobalProxy() const {
+  return MainWorldScriptContext()->Global();
+}
+
 bool WebFrame::ScriptCanAccess(WebFrame* target) {
   return BindingSecurity::ShouldAllowAccessToFrame(
       CurrentDOMWindow(MainThreadIsolate()), ToCoreFrame(*target),