Deprecate MediaStream label, ended attributes and stop() method

Source/core/frame/UseCounter.cpp

 /*
  * 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 920 matching lines @@
     case PrefixedMouseEventMovementY:
         return replacedBy("webkitMovementY", "movementY");
 
     case VideoFullscreenAllowedExemption:
         return "Entering fullscreen in an <iframe> with no allowfullscreen attribute is deprecated and will stop working in M46, around October 2015. Please use the allowfullscreen attribute.";
 
     case SVGSMILElementInDocument:
     case SVGSMILAnimationInImageRegardlessOfCache:
         return "SVG's SMIL animations (<animate>, <set>, etc.) are deprecated and will be removed. Please use CSS animations or Web animations instead.";
 
+    case MediaStreamLabel:
+        return "'MediaStream.label' is deprecated. See http://w3c.github.io/mediacapture-main/getusermedia.html#idl-def-MediaStream for more details.";

[philipj_slow, 2015/06/24 10:18:17]

Please add a blank line after every return like above in this file.

I think that we should set a date for the removal so that people know to take it
seriously. If this lands this week the deprecation will be in M45, and two
release cycles ought to be enough, so removal in M47. In other words, this
message:
"'MediaStream.label' is deprecated and will be removed in M47, around November
2015. Please use 'MediaStream.id' instead.";

And similarly for the below.

[shiva.jm, 2015/06/24 12:06:42]

Done.

+    case MediaStreamStop:
+        return "'MediaStream.stop()' is deprecated. Please use MediaStream.active attribute instead.";
+    case MediaStreamEnded:
+        return "'MediaStream.ended' is deprecated. Please use MediaStream.active attribute instead.";
+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();
     }
 }
 
 void UseCounter::count(CSSParserContext context, CSSPropertyID feature)
 {
     ASSERT(feature >= firstCSSProperty);
     ASSERT(feature <= lastUnresolvedCSSProperty);
@@ skipping 27 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        http://crbug.com/242125
     if (sheetContents && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace blink