mac: Remove code that was only needed on 10.5

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/memory/scoped_nsobject.h"
 
 @class CrTrackingAreaOwnerProxy;
 
 // The CrTrackingArea can be used in place of an NSTrackingArea to shut off
 // messaging to the |owner| at a specific point in time.
 @interface CrTrackingArea : NSTrackingArea {
  @private
   scoped_nsobject<CrTrackingAreaOwnerProxy> ownerProxy_;
 }
 
 // Designated initializer. Forwards all arguments to the superclass, but wraps
 // |owner| in a proxy object.
-//
-// The |proxiedOwner:| paramater has been renamed due to an incompatiblity with
-// the 10.5 SDK. Since that SDK version declares |-[NSTrackingArea's init...]|'s
-// return type to be |NSTrackingArea*| rather than |id|, a more generalized type
-// can't be returned by the subclass. Until the project switches to the 10.6 SDK
-// (where Apple changed the return type to |id|), this ugly hack must exist.
-// TODO(rsesek): Remove this when feasabile.
 - (id)initWithRect:(NSRect)rect
            options:(NSTrackingAreaOptions)options
-      proxiedOwner:(id)owner  // 10.5 SDK hack. Remove at some point.
+             owner:(id)owner
           userInfo:(NSDictionary*)userInfo;
 
 // 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
@@ skipping 14 matching lines @@
   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_