mac: Update clients of scoped_nsobject.h.

ui/base/cocoa/tracking_area.h

Index: ui/base/cocoa/tracking_area.h
diff --git a/ui/base/cocoa/tracking_area.h b/ui/base/cocoa/tracking_area.h
index 2800bc27cad61f8c04452b8c85fd5b39b24460e0..782cdaea2703b2eb3f0584c9b78446fca6fc99a8 100644
--- a/ui/base/cocoa/tracking_area.h
+++ b/ui/base/cocoa/tracking_area.h
@@ -7,7 +7,7 @@
 
 #import <AppKit/AppKit.h>
 
-#include "base/memory/scoped_nsobject.h"
+#include "base/mac/scoped_nsobject.h"
 #include "ui/base/ui_export.h"
 
 @class CrTrackingAreaOwnerProxy;
@@ -17,7 +17,7 @@
 UI_EXPORT
 @interface CrTrackingArea : NSTrackingArea {
  @private
-  scoped_nsobject<CrTrackingAreaOwnerProxy> ownerProxy_;
+  base::scoped_nsobject<CrTrackingAreaOwnerProxy> ownerProxy_;
 }
 
 // Designated initializer. Forwards all arguments to the superclass, but wraps
@@ -56,7 +56,7 @@ class UI_EXPORT ScopedCrTrackingArea {
   CrTrackingArea* get() const;
 
  private:
-  scoped_nsobject<CrTrackingArea> tracking_area_;
+  base::scoped_nsobject<CrTrackingArea> tracking_area_;
   DISALLOW_COPY_AND_ASSIGN(ScopedCrTrackingArea);
 };