Change var blah_blah -> blahBlah.

chrome/browser/resources/file_manager/js/media/media_controls.js

 // 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.
 
 /**
  * @fileoverview MediaControls class implements media playback controls
  * that exist outside of the audio/video HTML element.
  */
 
 /**
@@ skipping 968 matching lines @@
   if (opt_fullScreenToggle) {
     this.fullscreenButton_ =
         this.createButton('fullscreen', opt_fullScreenToggle);
   }
 
   if (opt_stateIconParent) {
     this.stateIcon_ = this.createControl(
         'playback-state-icon', opt_stateIconParent);
   }
 
-  var video_controls = this;
+  var videoControls = this;
   chrome.mediaPlayerPrivate.onTogglePlayState.addListener(
-      function() { video_controls.togglePlayStateWithFeedback(); });
+      function() { videoControls.togglePlayStateWithFeedback(); });
 }
 
 /**
  * No resume if we are withing this margin from the start or the end.
  */
 VideoControls.RESUME_MARGIN = 0.03;
 
 /**
  * No resume for videos shorter than this.
  */
@@ skipping 124 matching lines @@
   this.container_.classList.add('audio-controls');
 
   this.advanceTrack_ = advanceTrack;
 
   this.initPlayButton();
   this.initTimeControls(false /* no seek mark */);
   /* No volume controls */
   this.createButton('previous', this.onAdvanceClick_.bind(this, false));
   this.createButton('next', this.onAdvanceClick_.bind(this, true));
 
-  var audio_controls = this;
+  var audioControls = this;
   chrome.mediaPlayerPrivate.onNextTrack.addListener(
-      function() { audio_controls.onAdvanceClick_(true); });
+      function() { audioControls.onAdvanceClick_(true); });
   chrome.mediaPlayerPrivate.onPrevTrack.addListener(
-      function() { audio_controls.onAdvanceClick_(false); });
+      function() { audioControls.onAdvanceClick_(false); });
   chrome.mediaPlayerPrivate.onTogglePlayState.addListener(
-      function() { audio_controls.togglePlayState(); });
+      function() { audioControls.togglePlayState(); });
 }
 
 AudioControls.prototype = { __proto__: MediaControls.prototype };
 
 /**
  * Media completion handler. Advances to the next track.
  */
 AudioControls.prototype.onMediaComplete = function() {
   this.advanceTrack_(true);
 };
@@ skipping 10 matching lines @@
 AudioControls.prototype.onAdvanceClick_ = function(forward) {
   if (!forward &&
       (this.getMedia().currentTime > AudioControls.TRACK_RESTART_THRESHOLD)) {
     // We are far enough from the beginning of the current track.
     // Restart it instead of than skipping to the previous one.
     this.getMedia().currentTime = 0;
   } else {
     this.advanceTrack_(forward);
   }
 };