Prepare chrome/ for compilation with OS X 10.7 deployment target.

chrome/browser/ui/cocoa/app_menu/menu_tracked_button.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/app_menu/menu_tracked_button.h"
 
+#include "ui/base/cocoa/cocoa_base_utils.h"
+
 @interface MenuTrackedButton (Private)
 - (void)doHighlight:(BOOL)highlight;
 - (void)checkMouseInRect;
 - (NSRect)insetBounds;
 @end
 
 @implementation MenuTrackedButton
 
 @synthesize tracking = tracking_;
 
@@ skipping 60 matching lines @@
   [[self cell] setHighlighted:highlight];
   [self setNeedsDisplay];
 }
 
 // Checks if the user's current mouse location is over this button.  If it is,
 // the user is merely hovering here.  If it is not, then disable the highlight.
 // If the menu is opened in non-sticky mode, the button does not receive enter/
 // exit mouse events and thus polling is necessary.
 - (void)checkMouseInRect {
   NSPoint point = [NSEvent mouseLocation];
-  point = [[self window] convertScreenToBase:point];
+  point = ui::ConvertPointFromScreenToWindow([self window], point);
   point = [self convertPoint:point fromView:nil];
   if (!NSPointInRect(point, [self insetBounds])) {
     [self doHighlight:NO];
   }
 }
 
 // Returns the bounds of the receiver slightly inset to avoid highlighting both
 // buttons in a pair that overlap.
 - (NSRect)insetBounds {
   return NSInsetRect([self bounds], 2, 1);
 }
 
 @end