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

content/renderer/media/mock_media_stream_dependency_factory.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 "content/renderer/media/mock_media_stream_dependency_factory.h"
 
 #include "base/logging.h"
 #include "content/renderer/media/mock_peer_connection_impl.h"
 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
 #include "third_party/libjingle/source/talk/base/scoped_ref_ptr.h"
@@ skipping 185 matching lines @@
   NOTIMPLEMENTED();
 }
 
 cricket::VideoRenderer* MockLocalVideoTrack::FrameInput() {
   NOTIMPLEMENTED();
   return NULL;
 }
 
 std::string MockLocalVideoTrack::kind() const {
   NOTIMPLEMENTED();
-  return "";
+  return std::string();
 }
 
 std::string MockLocalVideoTrack::id() const { return id_; }
 
 bool MockLocalVideoTrack::enabled() const { return enabled_; }
 
 MockLocalVideoTrack::TrackState MockLocalVideoTrack::state() const {
   NOTIMPLEMENTED();
   return kInitializing;
 }
@@ skipping 15 matching lines @@
 void MockLocalVideoTrack::UnregisterObserver(ObserverInterface* observer) {
   NOTIMPLEMENTED();
 }
 
 VideoSourceInterface* MockLocalVideoTrack::GetSource() const {
   return source_;
 }
 
 std::string MockLocalAudioTrack::kind() const {
   NOTIMPLEMENTED();
-  return "";
+  return std::string();
 }
 
 std::string MockLocalAudioTrack::id() const { return id_; }
 
 bool MockLocalAudioTrack::enabled() const { return enabled_; }
 
 MockLocalVideoTrack::TrackState MockLocalAudioTrack::state() const {
   NOTIMPLEMENTED();
   return kInitializing;
 }
@@ skipping 32 matching lines @@
   virtual cricket::SessionDescription* description() OVERRIDE {
     NOTIMPLEMENTED();
     return NULL;
   }
   virtual const cricket::SessionDescription* description() const OVERRIDE {
     NOTIMPLEMENTED();
     return NULL;
   }
   virtual std::string session_id() const OVERRIDE {
     NOTIMPLEMENTED();
-    return "";
+    return std::string();
   }
   virtual std::string session_version() const OVERRIDE {
     NOTIMPLEMENTED();
-    return "";
+    return std::string();
   }
   virtual std::string type() const OVERRIDE {
     return type_;
   }
   virtual bool AddCandidate(const IceCandidateInterface* candidate) OVERRIDE {
     NOTIMPLEMENTED();
     return false;
   }
   virtual size_t number_of_mediasections() const OVERRIDE {
     NOTIMPLEMENTED();
@@ skipping 140 matching lines @@
 
 webrtc::IceCandidateInterface*
 MockMediaStreamDependencyFactory::CreateIceCandidate(
     const std::string& sdp_mid,
     int sdp_mline_index,
     const std::string& sdp) {
   return new MockIceCandidate(sdp_mid, sdp_mline_index, sdp);
 }
 
 }  // namespace content