Revert "Make scrubbing a MediaControls-internal concept"

Source/core/html/shadow/MediaControls.cpp

Index: Source/core/html/shadow/MediaControls.cpp
diff --git a/Source/core/html/shadow/MediaControls.cpp b/Source/core/html/shadow/MediaControls.cpp
index e2e5431ee3eee82a95a4b242692b452ae4047c7b..29bef6fc94f68fc1f96b5a94d99fa8b105f7d1fd 100644
--- a/Source/core/html/shadow/MediaControls.cpp
+++ b/Source/core/html/shadow/MediaControls.cpp
@@ -61,7 +61,6 @@ MediaControls::MediaControls(HTMLMediaElement& mediaElement)
     , m_enclosure(0)
     , m_hideMediaControlsTimer(this, &MediaControls::hideMediaControlsTimerFired)
     , m_isMouseOverControls(false)
-    , m_isPausedForScrubbing(false)
 {
 }
 
@@ -250,9 +249,6 @@ void MediaControls::playbackStopped()
 
 void MediaControls::updatePlayState()
 {
-    if (m_isPausedForScrubbing)
-        return;
-
     if (m_overlayPlayButton)
         m_overlayPlayButton->updateDisplayType();
     m_playButton->updateDisplayType();
@@ -260,19 +256,18 @@ void MediaControls::updatePlayState()
 
 void MediaControls::beginScrubbing()
 {
-    if (!mediaElement().togglePlayStateWillPlay()) {
-        m_isPausedForScrubbing = true;
-        mediaElement().togglePlayState();
-    }
+    if (mediaElement().controller())
+        mediaElement().controller()->beginScrubbing();
+    else
+        mediaElement().beginScrubbing();
 }
 
 void MediaControls::endScrubbing()
 {
-    if (m_isPausedForScrubbing) {
-        m_isPausedForScrubbing = false;
-        if (mediaElement().togglePlayStateWillPlay())
-            mediaElement().togglePlayState();
-    }
+    if (mediaElement().controller())
+        mediaElement().controller()->endScrubbing();
+    else
+        mediaElement().endScrubbing();
 }
 
 void MediaControls::updateCurrentTimeDisplay()