Move MainWorldScriptContext accessor/method from WebFrame to WebLocalFrame.

extensions/renderer/runtime_custom_bindings.cc

Index: extensions/renderer/runtime_custom_bindings.cc
diff --git a/extensions/renderer/runtime_custom_bindings.cc b/extensions/renderer/runtime_custom_bindings.cc
index 66ed982fb558d4d96dabdee457734b7dc22969f8..fb1e4814c27afb189d5d4bb2bd0529f401230ac3 100644
--- a/extensions/renderer/runtime_custom_bindings.cc
+++ b/extensions/renderer/runtime_custom_bindings.cc
@@ -94,7 +94,7 @@ void RuntimeCustomBindings::GetExtensionViews(
     // main views, not any subframes. (Returning subframes can cause broken
     // behavior by treating an app window's iframe as its main frame, and maybe
     // other nastiness).
-    blink::WebFrame* web_frame = frame->GetWebFrame();
+    blink::WebLocalFrame* web_frame = frame->GetWebFrame();
     if (web_frame->Top() != web_frame)
       continue;