[DevTools] Use device metrics emulation implemented in content.

Source/core/page/Screen.cpp

 /*
  * Copyright (C) 2007 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 30 matching lines @@
 Screen::Screen(Frame* frame)
     : DOMWindowProperty(frame)
 {
     ScriptWrappable::init(this);
 }
 
 unsigned Screen::height() const
 {
     if (!m_frame)
         return 0;
-    long height = static_cast<long>(screenRect(m_frame->view()).height());
-    InspectorInstrumentation::applyScreenHeightOverride(m_frame, &height);
-    return static_cast<unsigned>(height);
+    return static_cast<unsigned>(screenRect(m_frame->view()).height());
 }
 
 unsigned Screen::width() const
 {
     if (!m_frame)
         return 0;
-    long width = static_cast<long>(screenRect(m_frame->view()).width());
-    InspectorInstrumentation::applyScreenWidthOverride(m_frame, &width);
-    return static_cast<unsigned>(width);
+    return static_cast<unsigned>(screenRect(m_frame->view()).width());
 }
 
 unsigned Screen::colorDepth() const
 {
     if (!m_frame)
         return 0;
     return static_cast<unsigned>(screenDepth(m_frame->view()));
 }
 
 unsigned Screen::pixelDepth() const
@@ skipping 25 matching lines @@
 }
 
 unsigned Screen::availWidth() const
 {
     if (!m_frame)
         return 0;
     return static_cast<unsigned>(screenAvailableRect(m_frame->view()).width());
 }
 
 } // namespace WebCore