[Mac] Apply CrTrackingArea to the two other places where we get |-mouseMoved:| zombie messages.

chrome/browser/ui/cocoa/tracking_area.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_TRACKING_AREA_H_
 #define CHROME_BROWSER_UI_COCOA_TRACKING_AREA_H_
 
 #import <AppKit/AppKit.h>
 
 #include "base/scoped_nsobject.h"
@@ skipping 23 matching lines @@
 
 // Prevents any future messages from being delivered to the |owner|.
 - (void)clearOwner;
 
 // Watches |window| for its NSWindowWillCloseNotification and calls
 // |-clearOwner| when the notification is observed.
 - (void)clearOwnerWhenWindowWillClose:(NSWindow*)window;
 
 @end
 
+// Scoper //////////////////////////////////////////////////////////////////////
+
+// Use an instance of this class to call |-clearOwner| on the |tracking_area_|
+// when this goes out of scope.
+class ScopedCrTrackingArea {
+ public:
+  // Takes ownership of |tracking_area| without retaining it.
+  explicit ScopedCrTrackingArea(CrTrackingArea* tracking_area = nil);
+  ~ScopedCrTrackingArea();
+
+  // This will call |scoped_nsobject<>::reset()| to take ownership of the new
+  // tracking area.
+  void reset(CrTrackingArea* tracking_area = nil);
+
+  CrTrackingArea* get() const;
+
+ private:
+  scoped_nsobject<CrTrackingArea> tracking_area_;
+  DISALLOW_COPY_AND_ASSIGN(ScopedCrTrackingArea);
+};
+
 #endif  // CHROME_BROWSER_UI_COCOA_TRACKING_AREA_H_