Move ActivationClient/Delegate to client namespace.

ui/aura/test/test_activation_client.cc

 // Copyright (c) 2011 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/test/test_activation_client.h"
 
 #include "ui/aura/window.h"
 
 namespace aura {
 namespace test {
 
 ////////////////////////////////////////////////////////////////////////////////
 // TestActivationClient, public:
 
 TestActivationClient::TestActivationClient() : active_window_(NULL) {
-  ActivationClient::SetActivationClient(this);
+  client::SetActivationClient(this);
 }
 
 TestActivationClient::~TestActivationClient() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// TestActivationClient, ActivationClient implementation:
+// TestActivationClient, client::ActivationClient implementation:
 
 void TestActivationClient::ActivateWindow(Window* window) {
   if (active_window_)
     active_window_->RemoveObserver(this);
   active_window_ = window;
   active_window_->AddObserver(this);
 }
 
 void TestActivationClient::DeactivateWindow(Window* window) {
   if (window == active_window_) {
@@ skipping 16 matching lines @@
 
 void TestActivationClient::OnWindowDestroyed(Window* window) {
   if (window == active_window_) {
     window->RemoveObserver(this);
     active_window_ = NULL;
   }
 }
 
 }  // namespace test
 }  // namespace aura