Use WebViewHelper::LocalMainFrame where possible.

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

 /*
  * Copyright (C) 2011 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 165 matching lines @@
 
   void RegisterMockedFileURLLoad(const KURL& url,
                                  const String& file_path,
                                  const String& mime_type = "image/png") {
     URLTestHelpers::RegisterMockedURLLoad(
         url, testing::WebTestDataPath(file_path.Utf8().data()), mime_type);
   }
 
   WebViewBase* WebView() { return helper_.WebView(); }
 
-  WebLocalFrameBase* MainFrameImpl() {
-    return helper_.WebView()->MainFrameImpl();
-  }
+  WebLocalFrameBase* MainFrameImpl() { return helper_.LocalMainFrame(); }
 
   HistogramTester histogram_tester_;
 
  private:
   FrameTestHelpers::WebViewHelper helper_;
   SimpleMHTMLPartsGenerationDelegate mhtml_delegate_;
 };
 
 TEST_F(WebFrameSerializerSanitizationTest, RemoveInlineScriptInAttributes) {
   String mhtml =
@@ skipping 183 matching lines @@
   EXPECT_NE(WTF::kNotFound,
             mhtml.Find("<template shadowmode=3D\"open\" shadowdelegatesfocus"));
   EXPECT_NE(WTF::kNotFound, mhtml.Find("<template shadowmode=3D\"closed\">"));
 
   // The special attribute present in the original page should be removed.
   EXPECT_EQ(WTF::kNotFound, mhtml.Find("shadowmode=3D\"foo\">"));
   EXPECT_EQ(WTF::kNotFound, mhtml.Find("shadowdelegatesfocus=3D\"bar\">"));
 }
 
 }  // namespace blink