Delete MessageViews cleared by "Clear All" after animation.

ui/message_center/views/message_list_view.cc

 // Copyright (c) 2015 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.
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 542 matching lines @@
   clear_all_started_ = true;
 
   views::View* child = clearing_all_views_.front();
   clearing_all_views_.pop_front();
 
   // Slide from left to right.
   gfx::Rect new_bounds = child->bounds();
   new_bounds.set_x(new_bounds.right() + kMarginBetweenItems);
   animator_.AnimateViewTo(child, new_bounds);
 
+  // Deleting the child after animation.
+  deleted_when_done_.insert(child);
+
   // Schedule to start sliding out next notification after a short delay.
   if (!clearing_all_views_.empty()) {
     base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, base::Bind(&MessageListView::AnimateClearingOneNotification,
                               weak_ptr_factory_.GetWeakPtr()),
         base::TimeDelta::FromMilliseconds(
             kAnimateClearingNextNotificationDelayMS));
   }
 }
 
 void MessageListView::SetRepositionTargetForTest(const gfx::Rect& target_rect) {
   SetRepositionTarget(target_rect);
 }
 
 }  // namespace message_center