Regression: 'Alt+Shift+i', shortcut key for "report an issue" works only once for every 2 tries.

chrome/browser/resources/feedback/js/take_screenshot.js

 // Copyright 2013 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.
 
 /**
  * Function to take the screenshot of the current screen.
  * @param {function(HTMLCanvasElement)} callback Callback for returning the
  *                                      canvas with the screenshot on it.
  */
 function takeScreenshot(callback) {
   var screenshotStream = null;
   var video = document.createElement('video');
 
   video.addEventListener('canplay', function(e) {
     if (screenshotStream) {
       var canvas = document.createElement('canvas');
       canvas.setAttribute('width', video.videoWidth);
       canvas.setAttribute('height', video.videoHeight);
       canvas.getContext('2d').drawImage(
           video, 0, 0, video.videoWidth, video.videoHeight);
 
       video.pause();
       video.src = '';
 
-      screenshotStream.stop();
+      screenshotStream.getVideoTracks()[0].stop();
       screenshotStream = null;
 
       callback(canvas);
     }
   }, false);
 
   navigator.webkitGetUserMedia(
     {
       video: {
         mandatory: {
           chromeMediaSource: 'screen',
           maxWidth: 4096,
           maxHeight: 2560
         }
       }
     },
     function(stream) {
       if (stream) {
         screenshotStream = stream;
         video.src = window.URL.createObjectURL(screenshotStream);
         video.play();
       }
     },
     function(err) {
       console.error('takeScreenshot failed: ' +
           err.name + '; ' + err.message + '; ' + err.constraintName);
     }
   );
 }