[Mac] Refactor bookmark pulsing into BookmarkBubbleObserverCocoa.

chrome/browser/ui/cocoa/bookmarks/bookmark_button.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.
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
 #import "chrome/browser/ui/cocoa/draggable_button.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #include "ui/base/window_open_disposition.h"
 
@@ skipping 234 matching lines @@
 + (BookmarkButton*)draggedButton;
 
 
 @end  // @interface BookmarkButton
 
 
 @interface BookmarkButton(TestingAPI)
 - (void)beginDrag:(NSEvent*)event;
 @end
 
-namespace bookmark_button {
-
-// Notifications for pulsing of bookmarks.
-extern NSString* const kPulseBookmarkButtonNotification;
-
-// Key for userInfo dict of a kPulseBookmarkButtonNotification.
-// Value is a [NSValue valueWithPointer:]; pointer is a (const BookmarkNode*).
-extern NSString* const kBookmarkKey;
-
-// Key for userInfo dict of a kPulseBookmarkButtonNotification.
-// Value is a [NSNumber numberWithBool:] to turn pulsing on or off.
-extern NSString* const kBookmarkPulseFlagKey;
-
-};