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

chrome/renderer/extensions/user_script_slave.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/renderer/extensions/user_script_slave.h"
 
 #include <map>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 74 matching lines @@
   return new_id;
 }
 
 std::string UserScriptSlave::GetExtensionIdForIsolatedWorld(
     int isolated_world_id) {
   for (IsolatedWorldMap::iterator iter = isolated_world_ids_.begin();
        iter != isolated_world_ids_.end(); ++iter) {
     if (iter->second == isolated_world_id)
       return iter->first;
   }
-  return "";
+  return std::string();
 }
 
 // static
 void UserScriptSlave::InitializeIsolatedWorld(int isolated_world_id,
                                               const Extension* extension) {
   const URLPatternSet& permissions =
       extension->GetEffectiveHostPermissions();
   for (URLPatternSet::const_iterator i = permissions.begin();
        i != permissions.end(); ++i) {
     const char* schemes[] = {
@@ skipping 268 matching lines @@
   } else if (location == UserScript::DOCUMENT_IDLE) {
     UMA_HISTOGRAM_COUNTS_100("Extensions.InjectIdle_ScriptCount", num_scripts);
     if (num_scripts)
       UMA_HISTOGRAM_TIMES("Extensions.InjectIdle_Time", timer.Elapsed());
   } else {
     NOTREACHED();
   }
 }
 
 }  // namespace extensions