Simplify tests by using Web*Impl types directly.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/TopControls.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/page/Page.h"
 #include "core/page/scrolling/RootScrollerController.h"
@@ skipping 105 matching lines @@
         webViewImpl()->handleInputEvent(
             generateEvent(WebInputEvent::GestureScrollBegin));
         webViewImpl()->handleInputEvent(
             generateEvent(WebInputEvent::GestureScrollUpdate, 0, -deltaY));
         webViewImpl()->handleInputEvent(
             generateEvent(WebInputEvent::GestureScrollEnd));
     }
 
     WebViewImpl* webViewImpl() const
     {
-        return m_helper.webViewImpl();
+        return m_helper.webView();
     }
 
     FrameHost& frameHost() const
     {
-        return m_helper.webViewImpl()->page()->frameHost();
+        return m_helper.webView()->page()->frameHost();
     }
 
     LocalFrame* mainFrame() const
     {
-        return toWebLocalFrameImpl(webViewImpl()->mainFrame())->frame();
+        return webViewImpl()->mainFrameImpl()->frame();
     }
 
     WebLocalFrame* mainWebFrame() const
     {
-        return toWebLocalFrameImpl(webViewImpl()->mainFrame());
+        return webViewImpl()->mainFrameImpl();
     }
 
     FrameView* mainFrameView() const
     {
         return webViewImpl()->mainFrameImpl()->frame()->view();
     }
 
     VisualViewport& visualViewport() const
     {
         return frameHost().visualViewport();
@@ skipping 339 matching lines @@
             body,
             exceptionState);
 
         ASSERT_EQ(body, iframe->contentDocument()->rootScroller());
     }
 }
 
 } // namespace
 
 } // namespace blink