Web Audio: when media playback requires a user gesture, apply rule to cross origin iframes.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/Deprecation.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/FrameConsole.h"
 #include "core/frame/FrameHost.h"
@@ skipping 362 matching lines @@
 
     case UseCounter::V8SVGSVGElement_UseCurrentView_AttributeGetter:
         return willBeRemoved("SVGSVGElement.useCurrentView", M56, "4511711998509056");
 
     case UseCounter::V8SVGSVGElement_CurrentView_AttributeGetter:
         return willBeRemoved("SVGSVGElement.currentView", M56, "4511711998509056");
 
     case UseCounter::V8SVGViewElement_ViewTarget_AttributeGetter:
         return willBeRemoved("SVGViewElement.viewTarget", M56, "5665473114931200");
 
-    case UseCounter::WebAudioAutoplayCrossOriginIframe:
-        return willBeRemoved("Web Audio autoplay (without user gesture) from cross-origin iframes", M55, "6406908126691328");
-
     case UseCounter::ScriptInvalidTypeOrLanguage:
         return willBeRemoved("Fetching scripts with an invalid type/language attributes", M56, "5760718284521472");
 
     // The PaymentAddress.careOf was deprecated and then will be removed in M56.
     // Please see: https://www.chromestatus.com/features/5728579069411328
     case UseCounter::PaymentAddressCareOf:
         return willBeRemoved("PaymentAddress.careOf", M56, "5728579069411328");
 
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();
     }
 }
 
 } // namespace blink