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

chrome/browser/media/media_stream_devices_controller.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/media/media_stream_devices_controller.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "base/values.h"
 #include "chrome/browser/content_settings/content_settings_provider.h"
@@ skipping 261 matching lines @@
       extensions::TabCaptureRegistryFactory::GetForProfile(profile_);
 
   if (!registry->VerifyRequest(request_.render_process_id,
                                request_.render_view_id)) {
     Deny(false);
   } else {
     content::MediaStreamDevices devices;
 
     if (request_.audio_type == content::MEDIA_TAB_AUDIO_CAPTURE) {
       devices.push_back(content::MediaStreamDevice(
-          content::MEDIA_TAB_AUDIO_CAPTURE, "", ""));
+          content::MEDIA_TAB_AUDIO_CAPTURE, std::string(), std::string()));
     }
     if (request_.video_type == content::MEDIA_TAB_VIDEO_CAPTURE) {
       devices.push_back(content::MediaStreamDevice(
-          content::MEDIA_TAB_VIDEO_CAPTURE, "", ""));
+          content::MEDIA_TAB_VIDEO_CAPTURE, std::string(), std::string()));
     }
 
     callback_.Run(devices);
   }
 #endif
 }
 
 bool MediaStreamDevicesController::IsSchemeSecure() const {
   return (request_.security_origin.SchemeIsSecure());
 }
@@ skipping 32 matching lines @@
   }
   if (webcam_requested_) {
     profile_->GetHostContentSettingsMap()->SetContentSetting(
         primary_pattern,
         ContentSettingsPattern::Wildcard(),
         CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA,
         std::string(),
         content_setting);
   }
 }