Move DisplayUtils methods into gfx::Screen.

chrome/browser/metrics/display_utils_mac.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 <ApplicationServices/ApplicationServices.h>
-
-// static
-void DisplayUtils::GetPrimaryDisplayDimensions(int* width, int* height) {
-  CGDirectDisplayID main_display = CGMainDisplayID();
-  if (width)
-    *width = CGDisplayPixelsWide(main_display);
-  if (height)
-    *height = CGDisplayPixelsHigh(main_display);
-}
-
-// static
-int DisplayUtils::GetDisplayCount() {
-  // Don't just return the number of online displays.  It includes displays
-  // that mirror other displays, which are not desired in the count.  It's
-  // tempting to use the count returned by CGGetActiveDisplayList, but active
-  // displays exclude sleeping displays, and those are desired in the count.
-
-  // It would be ridiculous to have this many displays connected, but
-  // CGDirectDisplayID is just an integer, so supporting up to this many
-  // doesn't hurt.
-  CGDirectDisplayID online_displays[128];
-  CGDisplayCount online_display_count = 0;
-  if (CGGetOnlineDisplayList(arraysize(online_displays),
-                             online_displays,
-                             &online_display_count) != kCGErrorSuccess) {
-    // 1 is a reasonable assumption.
-    return 1;
-  }
-
-  int display_count = 0;
-  for (CGDisplayCount online_display_index = 0;
-       online_display_index < online_display_count;
-       ++online_display_index) {
-    CGDirectDisplayID online_display = online_displays[online_display_index];
-    if (CGDisplayMirrorsDisplay(online_display) == kCGNullDirectDisplay) {
-      // If this display doesn't mirror any other, include it in the count.
-      // The primary display in a mirrored set will be counted, but those that
-      // mirror it will not be.
-      ++display_count;
-    }
-  }
-
-  return display_count;
-}