More old files deletion.

ui/base/layout_mac.mm

-// Copyright (c) 2012 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 "ui/base/layout.h"
-
-#include <Cocoa/Cocoa.h>
-
-#include "base/mac/sdk_forward_declarations.h"
-
-namespace {
-
-float GetScaleFactorScaleForNativeView(gfx::NativeView view) {
-  if (NSWindow* window = [view window]) {
-    if ([window respondsToSelector:@selector(backingScaleFactor)])
-      return [window backingScaleFactor];
-    return [window userSpaceScaleFactor];
-  }
-
-  NSArray* screens = [NSScreen screens];
-  if (![screens count])
-    return 1.0f;
-
-  NSScreen* screen = [screens objectAtIndex:0];
-  if ([screen respondsToSelector:@selector(backingScaleFactor)])
-    return [screen backingScaleFactor];
-  return [screen userSpaceScaleFactor];
-}
-
-}  // namespace
-
-namespace ui {
-
-float GetScaleFactorForNativeView(gfx::NativeView view) {
-  return GetScaleFactorScaleForNativeView(view);
-}
-
-}  // namespace ui