Rewrite std::string("") to std::string(), Linux edition.

google_apis/gaia/oauth2_access_token_fetcher_unittest.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.
 //
 // A complete set of unit tests for OAuth2AccessTokenFetcher.
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 102 matching lines @@
   MessageLoop message_loop_;
   content::TestBrowserThread ui_thread_;
   MockUrlFetcherFactory factory_;
   MockOAuth2AccessTokenConsumer consumer_;
   TestingProfile profile_;
   OAuth2AccessTokenFetcher fetcher_;
 };
 
 // These four tests time out, see http://crbug.com/113446.
 TEST_F(OAuth2AccessTokenFetcherTest, DISABLED_GetAccessTokenRequestFailure) {
-  TestURLFetcher* url_fetcher = SetupGetAccessToken(false, 0, "");
+  TestURLFetcher* url_fetcher = SetupGetAccessToken(false, 0, std::string());
   EXPECT_CALL(consumer_, OnGetTokenFailure(_)).Times(1);
   fetcher_.Start("client_id", "client_secret", "refresh_token", ScopeList());
   fetcher_.OnURLFetchComplete(url_fetcher);
 }
 
 TEST_F(OAuth2AccessTokenFetcherTest,
        DISABLED_GetAccessTokenResponseCodeFailure) {
   TestURLFetcher* url_fetcher =
-      SetupGetAccessToken(true, net::HTTP_FORBIDDEN, "");
+      SetupGetAccessToken(true, net::HTTP_FORBIDDEN, std::string());
   EXPECT_CALL(consumer_, OnGetTokenFailure(_)).Times(1);
   fetcher_.Start("client_id", "client_secret", "refresh_token", ScopeList());
   fetcher_.OnURLFetchComplete(url_fetcher);
 }
 
 TEST_F(OAuth2AccessTokenFetcherTest, DISABLED_Success) {
   TestURLFetcher* url_fetcher = SetupGetAccessToken(
       true, net::HTTP_OK, kValidTokenResponse);
   EXPECT_CALL(consumer_, OnGetTokenSuccess("at1", _)).Times(1);
   fetcher_.Start("client_id", "client_secret", "refresh_token", ScopeList());
@@ skipping 83 matching lines @@
     url_fetcher.SetResponseString(kValidTokenResponse);
 
     std::string at;
     int expires_in;
     EXPECT_TRUE(OAuth2AccessTokenFetcher::ParseGetAccessTokenResponse(
         &url_fetcher, &at, &expires_in));
     EXPECT_EQ("at1", at);
     EXPECT_EQ(3600, expires_in);
   }
 }