Use base::StringPairs where appropriate from src/chrome/browser

chrome/browser/ui/sync/one_click_signin_helper.cc

Index: chrome/browser/ui/sync/one_click_signin_helper.cc
diff --git a/chrome/browser/ui/sync/one_click_signin_helper.cc b/chrome/browser/ui/sync/one_click_signin_helper.cc
index afbefba54f8a18613492325c2dff0132465ae4db..219d383e5a660c2d540e86ac9c52ca74b59bcb76 100644
--- a/chrome/browser/ui/sync/one_click_signin_helper.cc
+++ b/chrome/browser/ui/sync/one_click_signin_helper.cc
@@ -972,7 +972,7 @@ void OneClickSigninHelper::ShowInfoBarIfPossible(net::URLRequest* request,
     return;
 
   // Parse Google-Accounts-SignIn.
-  std::vector<std::pair<std::string, std::string> > pairs;
+  base::StringPairs pairs;
   base::SplitStringIntoKeyValuePairs(google_accounts_signin_value, '=', ',',
                                      &pairs);
   std::string session_index;