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 e1b0f9ce9f8075bc46d0983a97072a15d37de0de..9a3def4c1f871e2f73a635babb7ee67c40c38a90 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -373,6 +373,9 @@ 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");
+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();