Replace usage of WebVector::isEmpty with WebVector::empty().

content/renderer/media_recorder/media_recorder_handler.cc

 // Copyright 2015 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_recorder/media_recorder_handler.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 149 matching lines @@
   DCHECK(!media_stream_.isNull());
   DCHECK(timeslice_.is_zero());
   DCHECK(!webm_muxer_);
 
   timeslice_ = TimeDelta::FromMilliseconds(timeslice);
   slice_origin_timestamp_ = TimeTicks::Now();
 
   media_stream_.videoTracks(video_tracks_);
   media_stream_.audioTracks(audio_tracks_);
 
-  if (video_tracks_.isEmpty() && audio_tracks_.isEmpty()) {
+  if (video_tracks_.empty() && audio_tracks_.empty()) {
     LOG(WARNING) << __func__ << ": no media tracks.";
     return false;
   }
 
   const bool use_video_tracks =
-      !video_tracks_.isEmpty() && video_tracks_[0].isEnabled() &&
+      !video_tracks_.empty() && video_tracks_[0].isEnabled() &&
       video_tracks_[0].source().getReadyState() !=
           blink::WebMediaStreamSource::ReadyStateEnded;
   const bool use_audio_tracks =
-      !audio_tracks_.isEmpty() &&
-      MediaStreamAudioTrack::From(audio_tracks_[0]) &&
+      !audio_tracks_.empty() && MediaStreamAudioTrack::From(audio_tracks_[0]) &&
       audio_tracks_[0].isEnabled() &&
       audio_tracks_[0].source().getReadyState() !=
           blink::WebMediaStreamSource::ReadyStateEnded;
 
   if (!use_video_tracks && !use_audio_tracks) {
     LOG(WARNING) << __func__ << ": no tracks to be recorded.";
     return false;
   }
 
   webm_muxer_.reset(new media::WebmMuxer(
@@ skipping 183 matching lines @@
     recorder->OnData(audio_bus, timestamp);
 }
 
 void MediaRecorderHandler::SetAudioFormatForTesting(
     const media::AudioParameters& params) {
   for (const auto& recorder : audio_recorders_)
     recorder->OnSetFormat(params);
 }
 
 }  // namespace content