Remove unnecessary javascript

Previously, the Youtube API had a bug where a speed change from
another speed back to 1.0 would not register properly in Firefox.
The API has since been fixed, so there is no need for a workaround

common/lib/xmodule/xmodule/js/src/video/03_video_player.js

@@ -383,71 +383,9 @@ function(HTML5Video, Resizer) {
 
     function setPlaybackRate(newSpeed, useCueVideoById) {
         var duration = this.videoPlayer.duration(),
-            time = this.videoPlayer.currentTime,
-            methodName, youtubeId;
-
-        // There is a bug which prevents YouTube API to correctly set the speed
-        // to 1.0 from another speed in Firefox when in HTML5 mode. There is a
-        // fix which basically reloads the video at speed 1.0 when this change
-        // is requested (instead of simply requesting a speed change to 1.0).
-        // This has to be done only when the video is being watched in Firefox.
-        // We need to figure out what browser is currently executing this code.
-        //
-        // TODO: Check the status of
-        // http://code.google.com/p/gdata-issues/issues/detail?id=4654
-        // When the YouTube team fixes the API bug, we can remove this
-        // temporary bug fix.
-
-        // If useCueVideoById is true it will reload video again.
-        // Used useCueVideoById to fix the issue video not playing if we change
-        // the speed before playing the video.
-        if (
-          this.isHtml5Mode() && !(this.browserIsFirefox &&
-          (useCueVideoById || newSpeed === '1.0') && this.isYoutubeType())
-        ) {
-            this.videoPlayer.player.setPlaybackRate(newSpeed);
-        } else {
-            // We request the reloading of the video in the case when YouTube
-            // is in Flash player mode, or when we are in Firefox, and the new
-            // speed is 1.0. The second case is necessary to avoid the bug
-            // where in Firefox speed switching to 1.0 in HTML5 player mode is
-            // handled incorrectly by YouTube API.
-            methodName = 'cueVideoById';
-            youtubeId = this.youtubeId(newSpeed);
-
-            if (this.videoPlayer.isPlaying()) {
-                methodName = 'loadVideoById';
-            }
+            time = this.videoPlayer.currentTime;
 
-            this.videoPlayer.player[methodName](youtubeId, time);
-
-            // We need to call play() explicitly because after the call
-            // to functions cueVideoById() followed by seekTo() the video
-            // is in a PAUSED state.
-            //
-            // Why? This is how the YouTube API is implemented.
-            // sjson.search() only works if time is defined.
-            if (!_.isUndefined(time)) {
-                this.videoPlayer.updatePlayTime(time);
-            }
-            if (time > 0 && this.isFlashMode()) {
-                this.videoPlayer.seekTo(time);
-                this.trigger(
-                    'videoProgressSlider.updateStartEndTimeRegion',
-                    {
-                        duration: duration
-                    }
-                );
-            }
-            // In Html5 mode if video speed is changed before playing in firefox and
-            // changed speed is not '1.0' then manually trigger setPlaybackRate method.
-            // In browsers other than firefox like safari user can set speed to '1.0'
-            // if its not already set to '1.0' so in that case we don't have to
-            // call 'setPlaybackRate'
-            if (this.isHtml5Mode() && newSpeed != '1.0') {
-                this.videoPlayer.player.setPlaybackRate(newSpeed);
-            }
-        }
+        this.videoPlayer.player.setPlaybackRate(newSpeed);
     }
 
     function onSpeedChange(newSpeed) {