Give up focus if the focused view becomes unfocusable

ash/system/chromeos/audio/tray_audio.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/system/chromeos/audio/tray_audio.h"
 
 #include <cmath>
 
 #include "ash/ash_constants.h"
 #include "ash/ash_switches.h"
@@ skipping 187 matching lines @@
                    public views::SliderListener {
  public:
   VolumeView(SystemTrayItem* owner, bool is_default_view)
       : owner_(owner),
         icon_(NULL),
         slider_(NULL),
         bar_(NULL),
         device_type_(NULL),
         more_(NULL),
         is_default_view_(is_default_view) {
-    set_focusable(false);
+    SetFocusable(false);
     SetLayoutManager(new views::BoxLayout(views::BoxLayout::kHorizontal,
           kTrayPopupPaddingHorizontal, 0, kTrayPopupPaddingBetweenItems));
 
     icon_ = new VolumeButton(this);
     AddChildView(icon_);
 
     slider_ = new VolumeSlider(this);
     AddChildView(slider_);
 
     bar_ = new BarSeparator;
@@ skipping 425 matching lines @@
   if (audio_detail_)
     audio_detail_->Update();
   if (volume_view_) {
     volume_view_->SetVolumeLevel(GetVolumeLevel());
     volume_view_->Update();
   }
 }
 
 }  // namespace internal
 }  // namespace ash