A11y: Add/refactor methods for manipulating bitfields on AXNodeData.

ash/system/audio/volume_view.cc

 // Copyright 2014 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/audio/volume_view.h"
 
 #include <algorithm>
 
 #include "ash/metrics/user_metrics_action.h"
 #include "ash/resources/vector_icons/vector_icons.h"
@@ skipping 83 matching lines @@
     image_index_ = image_index;
   }
 
  private:
   // views::View:
   void GetAccessibleNodeData(ui::AXNodeData* node_data) override {
     node_data->SetName(
         l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_VOLUME_MUTE));
     node_data->role = ui::AX_ROLE_TOGGLE_BUTTON;
     if (CrasAudioHandler::Get()->IsOutputMuted())
-      node_data->AddStateFlag(ui::AX_STATE_PRESSED);
+      node_data->AddState(ui::AX_STATE_PRESSED);
   }
 
   views::ImageView* image_;
   int image_index_;
 
   DISALLOW_COPY_AND_ASSIGN(VolumeButton);
 };
 
 VolumeView::VolumeView(SystemTrayItem* owner,
                        bool is_default_view)
@@ skipping 159 matching lines @@
     if (new_volume > current_volume)
       HandleVolumeUp(new_volume);
     else
       HandleVolumeDown(new_volume);
   }
   icon_->Update();
 }
 
 }  // namespace tray
 }  // namespace ash