Deprecate MediaStream label, ended attributes and stop() method

Source/core/frame/UseCounter.cpp

Index: Source/core/frame/UseCounter.cpp
diff --git a/Source/core/frame/UseCounter.cpp b/Source/core/frame/UseCounter.cpp
index 4be6424aa5c6e6fef62172fee654c8d23926633e..aa28b5ae4706f81c58d13d5d72bfa1588d744916 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -935,6 +935,13 @@ String UseCounter::deprecationMessage(Feature feature)
     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, please do not use it. as per spec (http://w3c.github.io/mediacapture-main/getusermedia.html#idl-def-MediaStream).";

[Habib Virji, 2015/06/23 08:58:21]

Would suggest rewording this to: "'MediaStream.label' is deprecated. See
http://w3c.github.io/mediacapture-main/getusermedia.html#idl-def-MediaStream for
more details.";

Also not sure if link is useful as label is not mentioned in the spec as being
deprecated.

[shiva.jm, 2015/06/24 09:59:30]

Done.

+    case MediaStreamStop:
+        return "'MediaStream.stop()' is deprecated, after adding MediaStream.active attribute, please do not use it. as per spec (http://w3c.github.io/mediacapture-main/getusermedia.html#idl-def-MediaStream).";

[Habib Virji, 2015/06/23 08:58:21]

"'MediaStream.stop()' is deprecated. Please use MediaStream.active attribute
instead."; 

The spec link does not mention anything about stop(). Not sure if the link is an
aid here. 

[shiva.jm, 2015/06/24 09:59:30]

Done.

+    case MediaStreamEnded:
+        return "'MediaStream.ended' is deprecated, after adding MediaStream.active attribute, please do not use it. as per spec (http://w3c.github.io/mediacapture-main/getusermedia.html#idl-def-MediaStream).";

[Habib Virji, 2015/06/23 08:58:21]

Same as above comments.

[shiva.jm, 2015/06/24 09:59:30]

Done.

+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();