Replace views::Event with ui::Event.

ash/system/audio/tray_volume.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/audio/tray_volume.h"
 
 #include <cmath>
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
@@ skipping 159 matching lines @@
 
  private:
   // Overridden from views::View.
   virtual void OnBoundsChanged(const gfx::Rect& old_bounds) OVERRIDE {
     int w = width() - slider_->x();
     slider_->SetSize(gfx::Size(w, slider_->height()));
   }
 
   // Overridden from views::ButtonListener.
   virtual void ButtonPressed(views::Button* sender,
-                             const views::Event& event) OVERRIDE {
+                             const ui::Event& event) OVERRIDE {
     CHECK(sender == icon_ || sender == mute_);
     ash::SystemTrayDelegate* delegate =
         ash::Shell::GetInstance()->tray_delegate();
     delegate->SetAudioMuted(!delegate->IsAudioMuted());
   }
 
   // Overridden from views:SliderListener.
   virtual void SliderValueChanged(views::Slider* sender,
                                   float value,
                                   float old_value,
@@ skipping 71 matching lines @@
       tray_view()->SetVisible(GetInitialVisibility());
 
   if (volume_view_)
     volume_view_->Update();
   else
     PopupDetailedView(kTrayPopupAutoCloseDelayInSeconds, false);
 }
 
 }  // namespace internal
 }  // namespace ash