Replace views::Event with ui::Event.

ash/system/tray/tray_background_view.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/tray/tray_background_view.h"
 
 #include "ash/launcher/background_animator.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/status_area_widget.h"
@@ skipping 142 matching lines @@
 
 void TrayBackgroundView::OnMouseExited(const views::MouseEvent& event) {
   hover_background_animator_.SetPaintsBackground(false,
       internal::BackgroundAnimator::CHANGE_ANIMATE);
 }
 
 void TrayBackgroundView::ChildPreferredSizeChanged(views::View* child) {
   PreferredSizeChanged();
 }
 
-bool TrayBackgroundView::PerformAction(const views::Event& event) {
+bool TrayBackgroundView::PerformAction(const ui::Event& event) {
   return false;
 }
 
 void TrayBackgroundView::UpdateBackground(int alpha) {
   if (background_) {
     background_->set_alpha(hide_background_animator_.alpha() +
                            hover_background_animator_.alpha());
   }
   SchedulePaint();
 }
@@ skipping 36 matching lines @@
   } else {
     set_border(views::Border::CreateEmptyBorder(
         0, kPaddingFromInnerEdgeOfLauncherVerticalAlignment,
         on_edge ? kPaddingFromBottomOfScreenVerticalAlignment : 0,
         kPaddingFromOuterEdgeOfLauncherVerticalAlignment));
   }
 }
 
 }  // namespace internal
 }  // namespace ash