Cleanup: Adding more conversion helper interfaces.

Source/web/tests/ChromeClientImplTest.cpp

 /*
  * Copyright (C) 2012 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 72 matching lines @@
         , m_webViewClient(&m_result)
     {
     }
 
 protected:
     virtual void SetUp()
     {
         m_webView = toWebViewImpl(WebView::create(&m_webViewClient));
         m_mainFrame = WebFrame::create(&m_webFrameClient);
         m_webView->setMainFrame(m_mainFrame);
-        m_chromeClientImpl = static_cast<ChromeClientImpl*>(&m_webView->page()->chrome().client());
+        m_chromeClientImpl = toChromeClientImpl(m_webView->page()->chrome().client());
         m_result = WebNavigationPolicyIgnore;
     }
 
     virtual void TearDown()
     {
         m_webView->close();
         m_mainFrame->close();
     }
 
     WebNavigationPolicy getNavigationPolicyWithMouseEvent(int modifiers, WebMouseEvent::Button button, bool asPopup)
@@ skipping 158 matching lines @@
 
 TEST_F(GetNavigationPolicyTest, NotResizableForcesPopup)
 {
     m_chromeClientImpl->setResizable(false);
     EXPECT_TRUE(isNavigationPolicyPopup());
     m_chromeClientImpl->setResizable(true);
     EXPECT_FALSE(isNavigationPolicyPopup());
 }
 
 } // namespace