Remove MediaStream label, ended attributes and stop() method

Source/core/frame/UseCounter.h

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 417 matching lines @@
         DevToolsConsoleProfile = 518,
         SVGStyleElementTitle = 519,
         PictureSourceSrc = 520,
         // The above items are available in M38 branch.
 
         Picture = 521,
         Sizes = 522,
         SrcsetXDescriptor = 523,
         SrcsetWDescriptor = 524,
         SelectionContainsNode = 525,
-        MediaStreamEnded = 526,
         XMLExternalResourceLoad = 529,
         MixedContentPrivateHostnameInPublicHostname = 530,
         LegacyProtocolEmbeddedAsSubresource = 531,
         RequestedSubresourceWithEmbeddedCredentials = 532,
         NotificationCreated = 533,
         NotificationClosed = 534,
         NotificationPermissionRequested = 535,
-        MediaStreamLabel = 536,
-        MediaStreamStop = 537,
         ConsoleTimeline = 538,
         ConsoleTimelineEnd = 539,
         SRIElementWithMatchingIntegrityAttribute = 540,
         SRIElementWithNonMatchingIntegrityAttribute = 541,
         SRIElementWithUnparsableIntegrityAttribute = 542,
         V8Animation_StartTime_AttributeGetter = 545,
         V8Animation_StartTime_AttributeSetter = 546,
         V8Animation_CurrentTime_AttributeGetter = 547,
         V8Animation_CurrentTime_AttributeSetter = 548,
         V8Animation_PlaybackRate_AttributeGetter = 549,
@@ skipping 477 matching lines @@
 
     bool hasRecordedMeasurement(Feature feature) const { return m_countBits.hasRecordedMeasurement(feature); }
 
     CountBits m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h