Move common cloud print methods from service/cloud_print to common/cloud_print.

chrome/service/cloud_print/cloud_print_auth.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 CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_AUTH_H_
 #define CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_AUTH_H_
 
 #include <string>
 
 #include "base/values.h"
 #include "chrome/service/cloud_print/cloud_print_url_fetcher.h"
 #include "google_apis/gaia/gaia_oauth_client.h"
 #include "googleurl/src/gurl.h"
 
+namespace cloud_print {
+
 // CloudPrintAuth is a class to handle login, token refresh, and other
 // authentication tasks for Cloud Print.
 // CloudPrintAuth will create new robot account for this proxy if needed.
 // CloudPrintAuth will obtain new OAuth token.
 // CloudPrintAuth will schedule periodic OAuth token refresh
 // It is running in the same thread as CloudPrintProxyBackend::Core.
 class CloudPrintAuth
     : public base::RefCountedThreadSafe<CloudPrintAuth>,
       public CloudPrintURLFetcherDelegate,
       public gaia::GaiaOAuthClient::Delegate {
@@ skipping 77 matching lines @@
   std::string user_email_;
   // The email address of the robot account.
   std::string robot_email_;
   // client login token used to authenticate request to cloud print server to
   // get the robot account.
   std::string client_login_token_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPrintAuth);
 };
 
+}  // namespace cloud_print
+
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_AUTH_H_