Move DisplayUtils methods into gfx::Screen.

chrome/browser/metrics/display_utils_gtk.cc

-// Copyright (c) 2011 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 "chrome/browser/metrics/display_utils.h"
-
-#include <gdk/gdk.h>
-
-#include "content/browser/browser_thread.h"
-
-// static
-void DisplayUtils::GetPrimaryDisplayDimensions(int* width, int* height) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  GdkScreen* screen = gdk_screen_get_default();
-  if (width)
-    *width = gdk_screen_get_width(screen);
-  if (height)
-    *height = gdk_screen_get_height(screen);
-}
-
-// static
-int DisplayUtils::GetDisplayCount() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  // This query is kinda bogus for Linux -- do we want number of X screens?
-  // The number of monitors Xinerama has?  We'll just use whatever GDK uses.
-  GdkScreen* screen = gdk_screen_get_default();
-  return gdk_screen_get_n_monitors(screen);
-}