Merge from Chromium at DEPS revision r216972

This commit was generated by merge_to_master.py.

Change-Id: Ie5904a921ece9c5959b52c8e0b74db09fa08f144
diff --git a/Source/core/html/shadow/MediaControlElementTypes.h b/Source/core/html/shadow/MediaControlElementTypes.h
index 5a3fde8..fb53447 100644
--- a/Source/core/html/shadow/MediaControlElementTypes.h
+++ b/Source/core/html/shadow/MediaControlElementTypes.h
@@ -84,7 +84,7 @@
     virtual bool isShowing() const;
 
     virtual MediaControlElementType displayType() { return m_displayType; }
-    virtual const AtomicString& shadowPseudoId() const = 0;
+    virtual const AtomicString& part() const = 0;
 
     virtual void setMediaController(MediaControllerInterface* controller) { m_mediaController = controller; }
     virtual MediaControllerInterface* mediaController() const { return m_mediaController; }