ash: Remove use of ALLOW_THIS_IN_INITIALIZER_LIST.

ash/wm/video_detector.cc

 // Copyright (c) 2012 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 "ash/wm/video_detector.h"
 
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
@@ skipping 35 matching lines @@
   // Number of video-sized updates that we've seen in the second starting at
   // |second_start_time_|.  (Keeping a rolling window is overkill here.)
   int num_video_updates_in_second_;
 
   base::TimeTicks second_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowInfo);
 };
 
 VideoDetector::VideoDetector()
-    : ALLOW_THIS_IN_INITIALIZER_LIST(observer_manager_(this)),
+    : observer_manager_(this),
       is_shutting_down_(false) {
   aura::Env::GetInstance()->AddObserver(this);
   Shell::GetInstance()->AddShellObserver(this);
 }
 
 VideoDetector::~VideoDetector() {
   Shell::GetInstance()->RemoveShellObserver(this);
   aura::Env::GetInstance()->RemoveObserver(this);
 }
 
@@ skipping 52 matching lines @@
   bool is_fullscreen =
       toplevel_window ? wm::IsWindowFullscreen(toplevel_window) : false;
 
   FOR_EACH_OBSERVER(VideoDetectorObserver,
                     observers_,
                     OnVideoDetected(is_fullscreen));
   last_observer_notification_time_ = now;
 }
 
 }  // namespace ash