test_runner: Move three Mock* files into content namespace.

content/shell/renderer/test_runner/MockColorChooser.cpp

 // 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 "content/shell/renderer/test_runner/MockColorChooser.h"
 
 #include "content/shell/renderer/test_runner/WebTestDelegate.h"
 #include "content/shell/renderer/test_runner/WebTestProxy.h"
 
+using namespace WebTestRunner;
 using namespace blink;
-using namespace content;
 using namespace std;
 
-namespace WebTestRunner {
+namespace content {
 
 namespace {
 class HostMethodTask : public WebMethodTask<MockColorChooser> {
 public:
     typedef void (MockColorChooser::*CallbackMethodType)();
     HostMethodTask(MockColorChooser* object, CallbackMethodType callback)
         : WebMethodTask<MockColorChooser>(object)
         , m_callback(callback)
     { }
 
@@ skipping 24 matching lines @@
 void MockColorChooser::endChooser()
 {
     m_delegate->postDelayedTask(new HostMethodTask(this, &MockColorChooser::invokeDidEndChooser), 0);
 }
 
 void MockColorChooser::invokeDidEndChooser()
 {
     m_client->didEndChooser();
 }
 
-}
+}  // namespace content