"up-to-date" should only use hyphens when used as compound modifier of a noun

content/renderer/media/media_stream_audio_deliverer.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_DELIVERER_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_DELIVERER_H_
 
 #include <algorithm>
 #include <vector>
 
@@ skipping 119 matching lines @@
   // Protects concurrent access to |pending_consumers_| and |consumers_|.
   mutable base::Lock consumers_lock_;
 
   // Any consumers needing a call to OnSetFormat(), to be notified of the
   // changed audio format, are placed in this list. This includes consumers
   // added via AddConsumer() that need to have an initial OnSetFormat() call
   // before audio data is first delivered. Consumers are moved from this list to
   // |consumers_| on the audio thread.
   std::vector<Consumer*> pending_consumers_;
 
-  // Consumers that are up-to-date on the current audio format and are receiving
+  // Consumers that are up to date on the current audio format and are receiving
   // audio data are placed in this list.
   std::vector<Consumer*> consumers_;
 
   // Protects concurrent access to |params_|.
   mutable base::Lock params_lock_;
 
   // Specifies the current format of the audio passing through this
   // MediaStreamAudioDeliverer.
   media::AudioParameters params_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioDeliverer);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_DELIVERER_H_