Move remaining content test code into the content namespace.

content/test/test_content_client.h

 // 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.
 
 #ifndef CONTENT_TEST_TEST_CONTENT_CLIENT_H_
 #define CONTENT_TEST_TEST_CONTENT_CLIENT_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "content/public/common/content_client.h"
 #include "ui/base/resource/data_pack.h"
 
-class TestContentClient : public content::ContentClient {
+namespace content {
+
+class TestContentClient : public ContentClient {
  public:
   TestContentClient();
   virtual ~TestContentClient();
 
-  // content::ContentClient:
+  // ContentClient:
   virtual std::string GetUserAgent() const OVERRIDE;
   virtual base::StringPiece GetDataResource(
       int resource_id,
       ui::ScaleFactor scale_factor) const OVERRIDE;
 
  private:
   ui::DataPack data_pack_;
 
   DISALLOW_COPY_AND_ASSIGN(TestContentClient);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_TEST_TEST_CONTENT_CLIENT_H_