Use WebViewHelper::LocalMainFrame where possible.

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2864 matching lines @@
   Page* page = web_view_helper.WebView()->GetPage();
   PageScaleConstraints constraints = RunViewportTest(page, 320, 352);
 
   EXPECT_EQ(320, constraints.layout_size.Width());
   EXPECT_EQ(352, constraints.layout_size.Height());
   EXPECT_NEAR(1.0f, constraints.initial_scale, 0.01f);
   EXPECT_NEAR(1.0f, constraints.minimum_scale, 0.01f);
   EXPECT_NEAR(5.0f, constraints.maximum_scale, 0.01f);
   EXPECT_TRUE(page->GetViewportDescription().user_zoom);
 
-  ExecuteScript(web_view_helper.WebView()->MainFrameImpl(),
+  ExecuteScript(web_view_helper.LocalMainFrame(),
                 "originalDoctype = document.doctype;"
                 "document.removeChild(originalDoctype);");
 
   constraints = RunViewportTest(page, 320, 352);
 
   EXPECT_EQ(320, constraints.layout_size.Width());
   EXPECT_EQ(352, constraints.layout_size.Height());
   EXPECT_NEAR(1.0f, constraints.initial_scale, 0.01f);
   EXPECT_NEAR(1.0f, constraints.minimum_scale, 0.01f);
   EXPECT_NEAR(5.0f, constraints.maximum_scale, 0.01f);
   EXPECT_TRUE(page->GetViewportDescription().user_zoom);
 
-  ExecuteScript(web_view_helper.WebView()->MainFrameImpl(),
+  ExecuteScript(web_view_helper.LocalMainFrame(),
                 "document.insertBefore(originalDoctype, document.firstChild);");
 
   constraints = RunViewportTest(page, 320, 352);
 
   EXPECT_EQ(320, constraints.layout_size.Width());
   EXPECT_EQ(352, constraints.layout_size.Height());
   EXPECT_NEAR(1.0f, constraints.initial_scale, 0.01f);
   EXPECT_NEAR(1.0f, constraints.minimum_scale, 0.01f);
   EXPECT_NEAR(5.0f, constraints.maximum_scale, 0.01f);
   EXPECT_TRUE(page->GetViewportDescription().user_zoom);
@@ skipping 304 matching lines @@
       base_url_ + "viewport/viewport-warnings-7.html", &web_frame_client,
       nullptr, nullptr, SetViewportSettings);
 
   Page* page = web_view_helper.WebView()->GetPage();
   RunViewportTest(page, 320, 352);
 
   EXPECT_EQ(0U, web_frame_client.messages.size());
 }
 
 }  // namespace blink