Warn about Web Audio without user gesture on Android no longer allowed on cross origin iframes.

third_party/WebKit/Source/core/frame/Deprecation.cpp

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index 71b341d3d91aa224705e35739dc506bcfb5875e0..7698375df9498e85ef5d4913d72eff261e2fe7ef 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -381,6 +381,9 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
     case UseCounter::NavigatorPointerEnabled:
         return "Navigator.pointerEnabled is a non-standard API added for experiments only. It will be removed in near future.";
 
+    case UseCounter::WebAudioAutoplayCrossOriginIframe:
+        return willBeRemoved("Web Audio autoplay (without user gesture) from cross origin iframes", 55, "6406908126691328");

[foolip, 2016/09/08 12:58:53]

cross-origin with a hyphen wins a grep fight and is how the specs I checked seem
to spell it.

[mlamouri (slow - plz ping), 2016/09/12 17:07:12]

Done.

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