Use WebViewHelper::LocalMainFrame where possible.

third_party/WebKit/Source/web/tests/FrameSerializerTest.cpp

 /*
  * Copyright (c) 2013, Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 100 matching lines @@
   }
 
   void RegisterSkipURL(const char* url) {
     skip_urls_.push_back(KURL(base_url_, url));
   }
 
   void Serialize(const char* url) {
     FrameTestHelpers::LoadFrame(helper_.WebView()->MainFrameImpl(),
                                 KURL(base_url_, url).GetString().Utf8().data());
     FrameSerializer serializer(resources_, *this);
-    Frame* frame = helper_.WebView()->MainFrameImpl()->GetFrame();
+    Frame* frame = helper_.LocalMainFrame()->GetFrame();
     for (; frame; frame = frame->Tree().TraverseNext()) {
       // This is safe, because tests do not do cross-site navigation
       // (and therefore don't have remote frames).
       serializer.SerializeFrame(*ToLocalFrame(frame));
     }
   }
 
   Deque<SerializedResource>& GetResources() { return resources_; }
 
   const SerializedResource* GetResource(const KURL& url,
@@ skipping 424 matching lines @@
                 KURL(kParsedURLString, "http://foo.com?--")));
   EXPECT_EQ("saved from url=(0020)http://foo.com/#-%2D",
             FrameSerializer::MarkOfTheWebDeclaration(
                 KURL(kParsedURLString, "http://foo.com#--")));
   EXPECT_EQ("saved from url=(0026)http://foo.com/#bar-%2Dbaz",
             FrameSerializer::MarkOfTheWebDeclaration(
                 KURL(kParsedURLString, "http://foo.com#bar--baz")));
 }
 
 }  // namespace blink