Simplify tests by using Web*Impl types directly.

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

Index: third_party/WebKit/Source/web/tests/RootScrollerTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/RootScrollerTest.cpp b/third_party/WebKit/Source/web/tests/RootScrollerTest.cpp
index ae6cd44c0e52ea29071819629b85450b2fb4c173..1ca7e9f3a0b896a2088f93f5ce35a0cef8612ad0 100644
--- a/third_party/WebKit/Source/web/tests/RootScrollerTest.cpp
+++ b/third_party/WebKit/Source/web/tests/RootScrollerTest.cpp
@@ -123,22 +123,22 @@ public:
 
     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