The 1st patch to disambiguate message center notifications

ui/message_center/cocoa/tray_view_controller.mm

 // Copyright (c) 2013 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 "ui/message_center/cocoa/tray_view_controller.h"
 
 #include <cmath>
 
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/time/time.h"
@@ skipping 643 matching lines @@
     return;
   [self hideNotificationsPendingRemoval];
 }
 
 - (void)hideNotificationsPendingRemoval {
   base::scoped_nsobject<NSMutableArray> animationDataArray(
       [[NSMutableArray alloc] init]);
 
   // Fade-out those notifications pending removal.
   for (MCNotificationController* notification in notifications_.get()) {
-    if (messageCenter_->HasNotification([notification notificationID]))
+    if (messageCenter_->FindVisibleNotificationById([notification notificationID]))
       continue;
     [notificationsPendingRemoval_ addObject:notification];
     [animationDataArray addObject:@{
         NSViewAnimationTargetKey : [notification view],
         NSViewAnimationEffectKey : NSViewAnimationFadeOutEffect
     }];
   }
 
   if ([notificationsPendingRemoval_ count] == 0)
     return;
@@ skipping 125 matching lines @@
     [pauseButton_ setDefaultImage: rb.GetNativeImageNamed(
         IDR_NOTIFICATION_DO_NOT_DISTURB_PRESSED).ToNSImage()];
   } else {
     [pauseButton_ setTrackingEnabled:YES];
     [pauseButton_ setDefaultImage:
         rb.GetNativeImageNamed(IDR_NOTIFICATION_DO_NOT_DISTURB).ToNSImage()];
   }
 }
 
 @end