Revert of Move JoinString to the base namespace

google_apis/gaia/gaia_oauth_client.cc

 // 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.
 
 #include "google_apis/gaia/gaia_oauth_client.h"
 
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_util.h"
@@ skipping 119 matching lines @@
   request_type_ = REFRESH_TOKEN;
   std::string post_body =
       "refresh_token=" + net::EscapeUrlEncodedData(refresh_token, true) +
       "&client_id=" + net::EscapeUrlEncodedData(oauth_client_info.client_id,
                                                 true) +
       "&client_secret=" +
       net::EscapeUrlEncodedData(oauth_client_info.client_secret, true) +
       "&grant_type=refresh_token";
 
   if (!scopes.empty()) {
-    std::string scopes_string = base::JoinString(scopes, " ");
+    std::string scopes_string = JoinString(scopes, ' ');
     post_body += "&scope=" + net::EscapeUrlEncodedData(scopes_string, true);
   }
 
   MakeGaiaRequest(GURL(GaiaUrls::GetInstance()->oauth2_token_url()),
                   post_body, max_retries, delegate);
 }
 
 void GaiaOAuthClient::Core::GetUserEmail(const std::string& oauth_access_token,
                                          int max_retries,
                                          Delegate* delegate) {
@@ skipping 252 matching lines @@
 }
 
 void GaiaOAuthClient::GetTokenHandleInfo(const std::string& token_handle,
                                          int max_retries,
                                          Delegate* delegate) {
   return core_->GetTokenInfo("token_handle", token_handle, max_retries,
                              delegate);
 }
 
 }  // namespace gaia