Convert Aura to use ui::Event.

ui/aura/desktop/desktop_activation_client.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 "ui/aura/desktop/desktop_activation_client.h"
 
 #include "base/auto_reset.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/client/activation_delegate.h"
 #include "ui/aura/client/activation_change_observer.h"
@@ skipping 79 matching lines @@
 void DesktopActivationClient::DeactivateWindow(Window* window) {
   if (window == current_active_)
     current_active_ = NULL;
 }
 
 Window* DesktopActivationClient::GetActiveWindow() {
   return current_active_;
 }
 
 bool DesktopActivationClient::OnWillFocusWindow(Window* window,
-                                                const Event* event) {
+                                                const ui::Event* event) {
   return CanActivateWindow(GetActivatableWindow(window));
 }
 
 void DesktopActivationClient::OnWindowDestroying(aura::Window* window) {
   if (current_active_ == window) {
     current_active_ = NULL;
     FOR_EACH_OBSERVER(aura::client::ActivationChangeObserver,
                       observers_,
                       OnWindowActivated(NULL, window));
 
@@ skipping 33 matching lines @@
     // that path instead.
     if (child->transient_parent())
       return GetActivatableWindow(child->transient_parent());
     parent = parent->parent();
     child = child->parent();
   }
   return NULL;
 }
 
 }  // namespace aura