Make aura::clients take Window instead of RootWindow

ui/aura/client/default_activation_client.cc

 // Copyright 2013 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/client/default_activation_client.h"
 
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/client/activation_delegate.h"
-#include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 
 namespace aura {
 namespace client {
 
 ////////////////////////////////////////////////////////////////////////////////
 // DefaultActivationClient, public:
 
-DefaultActivationClient::DefaultActivationClient(RootWindow* root_window)
+DefaultActivationClient::DefaultActivationClient(Window* root_window)
     : last_active_(NULL) {
   client::SetActivationClient(root_window, this);
 }
 
 DefaultActivationClient::~DefaultActivationClient() {
   for (unsigned int i = 0; i < active_windows_.size(); ++i) {
     active_windows_[i]->RemoveObserver(this);
   }
 }
 
@@ skipping 92 matching lines @@
     if (active_windows_[i] == window) {
       active_windows_.erase(active_windows_.begin() + i);
       window->RemoveObserver(this);
       return;
     }
   }
 }
 
 }  // namespace client
 }  // namespace aura