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

remoting/host/setup/daemon_controller_linux.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 "remoting/host/setup/daemon_controller.h"
 
 #include <unistd.h>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 300 matching lines @@
   } else {
     result = RESULT_FAILED;
   }
   done_callback.Run(result);
 }
 
 void DaemonControllerLinux::DoGetVersion(
     const GetVersionCallback& done_callback) {
   base::FilePath script_path;
   if (!GetScriptPath(&script_path)) {
-    done_callback.Run("");
+    done_callback.Run(std::string());
     return;
   }
   CommandLine command_line(script_path);
   command_line.AppendArg("--host-version");
 
   std::string version;
   int exit_code = 0;
   int result =
       base::GetAppOutputWithExitCode(command_line, &version, &exit_code);
   if (!result || exit_code != 0) {
     LOG(ERROR) << "Failed to run \"" << command_line.GetCommandLineString()
                << "\". Exit code: " << exit_code;
-    done_callback.Run("");
+    done_callback.Run(std::string());
     return;
   }
 
   TrimWhitespaceASCII(version, TRIM_ALL, &version);
   if (!ContainsOnlyChars(version, "0123456789.")) {
     LOG(ERROR) << "Received invalid host version number: " << version;
-    done_callback.Run("");
+    done_callback.Run(std::string());
     return;
   }
 
   done_callback.Run(version);
 }
 
 }  // namespace
 
 scoped_ptr<DaemonController> remoting::DaemonController::Create() {
   return scoped_ptr<DaemonController>(new DaemonControllerLinux());
 }
 
 }  // namespace remoting