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 0508a133bf78bf741cd430c2065c5814e5433eba..664a2f9cfe2bacfb75f17d889876c1a22f59bf0c 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -938,6 +938,15 @@ 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 and will be removed in M47, around November 2015. Please use 'MediaStream.id' instead.";
+
+    case MediaStreamStop:
+        return "'MediaStream.stop()' is deprecated and will be removed in M47, around November 2015. Please use 'MediaStream.active' instead.";
+
+    case MediaStreamEnded:
+        return "'MediaStream.ended' is deprecated and will be removed in M47, around November 2015. Please use 'MediaStream.active' instead.";
+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();