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

chrome/browser/safe_browsing/ping_manager.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/safe_browsing/ping_manager.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
@@ skipping 95 matching lines @@
 GURL SafeBrowsingPingManager::SafeBrowsingHitUrl(
     const GURL& malicious_url, const GURL& page_url,
     const GURL& referrer_url, bool is_subresource,
     SBThreatType threat_type) const {
   DCHECK(threat_type == SB_THREAT_TYPE_URL_MALWARE ||
          threat_type == SB_THREAT_TYPE_URL_PHISHING ||
          threat_type == SB_THREAT_TYPE_BINARY_MALWARE_URL ||
          threat_type == SB_THREAT_TYPE_BINARY_MALWARE_HASH ||
          threat_type == SB_THREAT_TYPE_CLIENT_SIDE_PHISHING_URL);
   std::string url = SafeBrowsingProtocolManagerHelper::ComposeUrl(
-      url_prefix_, "report", client_name_, version_, "");
+      url_prefix_, "report", client_name_, version_, std::string());
   std::string threat_list = "none";
   switch (threat_type) {
     case SB_THREAT_TYPE_URL_MALWARE:
       threat_list = "malblhit";
       break;
     case SB_THREAT_TYPE_URL_PHISHING:
       threat_list = "phishblhit";
       break;
     case SB_THREAT_TYPE_BINARY_MALWARE_URL:
       threat_list = "binurlhit";
@@ skipping 21 matching lines @@
           url_prefix_.c_str(),
           client_name_.c_str(),
           version_.c_str());
   std::string api_key = google_apis::GetAPIKey();
   if (!api_key.empty()) {
     base::StringAppendF(&url, "&key=%s",
                         net::EscapeQueryParamValue(api_key, true).c_str());
   }
   return GURL(url);
 }