Use base::StringPairs where appropriate from /chrome

chrome/browser/extensions/api/identity/gaia_web_auth_flow.cc

 // Copyright (c) 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 "chrome/browser/extensions/api/identity/gaia_web_auth_flow.h"
 
 #include "base/debug/trace_event.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 147 matching lines @@
   //
   // Because there is no double slash, everything after the scheme is
   // interpreted as a path, including the fragment.
 
   if (url.scheme() == redirect_scheme_ && !url.has_host() && !url.has_port() &&
       StartsWithASCII(url.GetContent(), redirect_path_prefix_, true)) {
     web_flow_.release()->DetachDelegateAndDelete();
 
     std::string fragment = url.GetContent().substr(
         redirect_path_prefix_.length(), std::string::npos);
-    std::vector<std::pair<std::string, std::string> > pairs;
+    base::StringPairs pairs;
     base::SplitStringIntoKeyValuePairs(fragment, '=', '&', &pairs);
     std::string access_token;
     std::string error;
     std::string expiration;
 
     for (std::vector<std::pair<std::string, std::string> >::iterator
              it = pairs.begin();
          it != pairs.end();
          ++it) {
       if (it->first == kOAuth2RedirectAccessTokenKey)
@@ skipping 34 matching lines @@
 }
 
 scoped_ptr<WebAuthFlow> GaiaWebAuthFlow::CreateWebAuthFlow(GURL url) {
   return scoped_ptr<WebAuthFlow>(new WebAuthFlow(this,
                                                  profile_,
                                                  url,
                                                  WebAuthFlow::INTERACTIVE));
 }
 
 }  // namespace extensions