Clean up around text track display state updates

Source/core/html/track/CueTimeline.cpp

 // 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 "config.h"
 #include "core/html/track/CueTimeline.h"
 
 #include "core/events/Event.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLTrackElement.h"
@@ skipping 312 matching lines @@
     for (size_t i = 0; i < previousCuesSize; ++i) {
         if (!currentCues.contains(previousCues[i])) {
             TextTrackCue* cue = previousCues[i].data();
             cue->setIsActive(false);
             cue->removeDisplayTree();
         }
     }
 
     // Update the current active cues.
     m_currentlyActiveCues = currentCues;
-
-    if (activeSetChanged)
-        mediaElement.updateTextTrackDisplay();
+    mediaElement.updateTextTrackDisplay();
 }
 
 void CueTimeline::beginIgnoringUpdateRequests()
 {
     ++m_ignoreUpdate;
 }
 
 void CueTimeline::endIgnoringUpdateRequests()
 {
     ASSERT(m_ignoreUpdate);
     --m_ignoreUpdate;
     if (!m_ignoreUpdate && mediaElement().inActiveDocument())
         updateActiveCues(mediaElement().currentTime());
 }
 
 DEFINE_TRACE(CueTimeline)
 {
     visitor->trace(m_mediaElement);
 }
 
 } // namespace blink