Change Page::m_mainFrame to be a Frame.

Source/core/css/MediaValues.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/css/MediaValues.h"
 
 #include "core/css/CSSHelper.h"
 #include "core/css/MediaValuesCached.h"
 #include "core/css/MediaValuesDynamic.h"
@@ skipping 58 matching lines @@
 }
 
 float MediaValues::calculateDevicePixelRatio(LocalFrame* frame) const
 {
     return frame->devicePixelRatio();
 }
 
 int MediaValues::calculateColorBitsPerComponent(LocalFrame* frame) const
 {
     ASSERT(frame && frame->page() && frame->page()->mainFrame());
-    if (screenIsMonochrome(frame->page()->mainFrame()->view()))
+    if (!frame->page()->mainFrame()->isLocalFrame()
+        || screenIsMonochrome(frame->page()->deprecatedLocalMainFrame()->view()))
         return 0;
     return screenDepthPerComponent(frame->view());
 }
 
 int MediaValues::calculateMonochromeBitsPerComponent(LocalFrame* frame) const
 {
     ASSERT(frame && frame->page() && frame->page()->mainFrame());
-    if (screenIsMonochrome(frame->page()->mainFrame()->view()))
-        return screenDepthPerComponent(frame->view());
-    return 0;
+    if (!frame->page()->mainFrame()->isLocalFrame()
+        || !screenIsMonochrome(frame->page()->deprecatedLocalMainFrame()->view()))
+        return 0;
+    return screenDepthPerComponent(frame->view());
 }
 
 int MediaValues::calculateDefaultFontSize(LocalFrame* frame) const
 {
     return frame->host()->settings().defaultFontSize();
 }
 
 bool MediaValues::calculateScanMediaType(LocalFrame* frame) const
 {
     ASSERT(frame && frame->view());
@@ skipping 95 matching lines @@
     default:
         return false;
     }
 
     ASSERT(factor > 0);
     result = value * factor;
     return true;
 }
 
 } // namespace