[Mac] Create CrTrackingArea and use it in TabStripController.

chrome/browser/ui/cocoa/tabs/tab_strip_controller.h

 // Copyright (c) 2010 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_TABS_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
 #include "base/scoped_ptr.h"
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller_target.h"
 #import "chrome/browser/ui/cocoa/url_drop_target.h"
 #import "third_party/GTM/AppKit/GTMWindowSheetController.h"
 
+@class CrTrackingArea;
 @class NewTabButton;
 @class TabContentsController;
 @class TabView;
 @class TabStripView;
 
 class Browser;
 class ConstrainedWindowMac;
 class TabStripModelObserverBridge;
 class TabStripModel;
 class TabContents;
@@ skipping 36 matching lines @@
   // YES if tabs are to be laid out vertically instead of horizontally.
   BOOL verticalLayout_;
 
  @private
   scoped_nsobject<TabStripView> tabStripView_;
   NSView* switchView_;  // weak
   scoped_nsobject<NSView> dragBlockingView_;  // avoid bad window server drags
   NewTabButton* newTabButton_;  // weak, obtained from the nib.
 
   // Tracks the newTabButton_ for rollovers.
-  scoped_nsobject<NSTrackingArea> newTabTrackingArea_;
+  scoped_nsobject<CrTrackingArea> newTabTrackingArea_;
   scoped_ptr<TabStripModelObserverBridge> bridge_;
   Browser* browser_;  // weak
   TabStripModel* tabStripModel_;  // weak
   // Delegate that is informed about tab state changes.
   id<TabStripControllerDelegate> delegate_;  // weak
 
   // YES if the new tab button is currently displaying the hover image (if the
   // mouse is currently over the button).
   BOOL newTabButtonShowingHoverImage_;
 
@@ skipping 31 matching lines @@
   // into being.
   BOOL initialLayoutComplete_;
 
   // Width available for resizing the tabs (doesn't include the new tab
   // button). Used to restrict the available width when closing many tabs at
   // once to prevent them from resizing to fit the full width. If the entire
   // width should be used, this will have a value of |kUseFullAvailableWidth|.
   float availableResizeWidth_;
   // A tracking area that's the size of the tab strip used to be notified
   // when the mouse moves in the tab strip
-  scoped_nsobject<NSTrackingArea> trackingArea_;
+  scoped_nsobject<CrTrackingArea> trackingArea_;
   TabView* hoveredTab_;  // weak. Tab that the mouse is hovering over
 
   // Array of subviews which are permanent (and which should never be removed),
   // such as the new-tab button, but *not* the tabs themselves.
   scoped_nsobject<NSMutableArray> permanentSubviews_;
 
   // The default favicon, so we can use one copy for all buttons.
   scoped_nsobject<NSImage> defaultFavIcon_;
 
   // The amount by which to indent the tabs on the left (to make room for the
@@ skipping 116 matching lines @@
 - (void)attachConstrainedWindow:(ConstrainedWindowMac*)window;
 - (void)removeConstrainedWindow:(ConstrainedWindowMac*)window;
 
 @end
 
 // Notification sent when the number of tabs changes. The object will be this
 // controller.
 extern NSString* const kTabStripNumberOfTabsChanged;
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_