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

chrome/browser/google_apis/base_operations.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 "chrome/browser/google_apis/base_operations.h"
 
 #include "base/json/json_reader.h"
 #include "base/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/task_runner_util.h"
@@ skipping 168 matching lines @@
   } else {
     // Even if there is no content data, UrlFetcher requires to set empty
     // upload data string for POST, PUT and PATCH methods, explicitly.
     // It is because that most requests of those methods have non-empty
     // body, and UrlFetcher checks whether it is actually not forgotten.
     if (request_type == URLFetcher::POST ||
         request_type == URLFetcher::PUT ||
         request_type == URLFetcher::PATCH) {
       // Set empty upload content-type and upload content, so that
       // the request will have no "Content-type: " header and no content.
-      url_fetcher_->SetUploadData("", "");
+      url_fetcher_->SetUploadData(std::string(), std::string());
     }
   }
 
   // Register to operation registry.
   NotifyStartToOperationRegistry();
 
   url_fetcher_->Start();
   started_ = true;
 }
 
@@ skipping 512 matching lines @@
 
   download_action_callback_.Run(code, temp_file);
   OnProcessURLFetchResultsComplete(code == HTTP_SUCCESS);
 }
 
 void DownloadFileOperation::RunCallbackOnPrematureFailure(GDataErrorCode code) {
   download_action_callback_.Run(code, base::FilePath());
 }
 
 }  // namespace google_apis