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

chrome/browser/ui/cocoa/tracking_area.h

Index: chrome/browser/ui/cocoa/tracking_area.h
diff --git a/chrome/browser/ui/cocoa/tracking_area.h b/chrome/browser/ui/cocoa/tracking_area.h
index c12c2fd39b2bba9fe0c881c7378a342c9ccf28f7..f63be3a021604950c7460b5c63679b80eacc2a58 100644
--- a/chrome/browser/ui/cocoa/tracking_area.h
+++ b/chrome/browser/ui/cocoa/tracking_area.h
@@ -41,4 +41,25 @@
 
 @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_