Move CrTrackingArea from chrome/browser/ui/cocoa to ui/base/cocoa.

chrome/browser/ui/cocoa/constrained_window/constrained_window_button.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_CONSTRAINED_WINDOW_CONSTRAINED_WINDOW_BUTTON_
 #define CHROME_BROWSER_UI_COCOA_CONSTRAINED_WINDOW_CONSTRAINED_WINDOW_BUTTON_
 
 #import <Cocoa/Cocoa.h>
 
-#import "chrome/browser/ui/cocoa/tracking_area.h"
+#import "ui/base/cocoa/tracking_area.h"
 
 // A push button for use in a constrained window. Specialized constrained
 // windows that need a push button should use this class instead of NSButton.
 @interface ConstrainedWindowButton : NSButton {
  @private
-  ScopedCrTrackingArea trackingArea_;
+  ui::ScopedCrTrackingArea trackingArea_;
 }
 
 @end
 
 // A button cell used by ConstrainedWindowButton.
 @interface ConstrainedWindowButtonCell : NSButtonCell {
  @private
   BOOL isMouseInside_;
 }
 
 @property(nonatomic, assign) BOOL isMouseInside;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_CONSTRAINED_WINDOW_CONSTRAINED_WINDOW_BUTTON_