Change Page::m_mainFrame to be a Frame.

Source/web/tests/PinchViewportTest.cpp

 // Copyright 2014 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 "config.h"
 
 #include "core/frame/PinchViewport.h"
 
 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 517 matching lines @@
 TEST_F(PinchViewportTest, TestSavedToHistoryItem)
 {
     initializeWithDesktopSettings();
     webViewImpl()->resize(IntSize(200, 300));
     webViewImpl()->layout();
 
     registerMockedHttpURLLoad("200-by-300.html");
     navigateTo(m_baseURL + "200-by-300.html");
 
     EXPECT_FLOAT_POINT_EQ(FloatPoint(0, 0),
-        webViewImpl()->page()->mainFrame()->loader().currentItem()->pinchViewportScrollPoint());
+        toLocalFrame(webViewImpl()->page()->mainFrame())->loader().currentItem()->pinchViewportScrollPoint());
 
     PinchViewport& pinchViewport = frame()->page()->frameHost().pinchViewport();
     pinchViewport.setScale(2);
 
-    EXPECT_EQ(2, webViewImpl()->page()->mainFrame()->loader().currentItem()->pageScaleFactor());
+    EXPECT_EQ(2, toLocalFrame(webViewImpl()->page()->mainFrame())->loader().currentItem()->pageScaleFactor());
 
     pinchViewport.setLocation(FloatPoint(10, 20));
 
     EXPECT_FLOAT_POINT_EQ(FloatPoint(10, 20),
-        webViewImpl()->page()->mainFrame()->loader().currentItem()->pinchViewportScrollPoint());
+        toLocalFrame(webViewImpl()->page()->mainFrame())->loader().currentItem()->pinchViewportScrollPoint());
 }
 
 // Test restoring a HistoryItem properly restores the pinch viewport's state.
 TEST_F(PinchViewportTest, TestRestoredFromHistoryItem)
 {
     initializeWithDesktopSettings();
     webViewImpl()->resize(IntSize(200, 300));
 
     registerMockedHttpURLLoad("200-by-300.html");
 
@@ skipping 236 matching lines @@
     pinchViewport.scrollIntoView(FloatRect(50, 75, 50, 75));
     EXPECT_POINT_EQ(IntPoint(50, 75), frame()->view()->scrollPosition());
     EXPECT_FLOAT_POINT_EQ(FloatPoint(), pinchViewport.visibleRect().location());
 
     pinchViewport.scrollIntoView(FloatRect(190, 290, 10, 10));
     EXPECT_POINT_EQ(IntPoint(100, 150), frame()->view()->scrollPosition());
     EXPECT_FLOAT_POINT_EQ(FloatPoint(50, 75), pinchViewport.visibleRect().location());
 }
 
 } // namespace