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 3bd043c64171cbfdcdb8f05129cf66b8f1806cc2..36d16fe764ed4588008c7ef7daa1f9e3eb0ba6ab 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),