Adding Deprecation Message for <keygen>

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 99 matching lines @@
 
     switch (milestone) {
     case 50:
         return "M50, around April 2016";
     case 51:
         return "M51, around May 2016";
     case 52:
         return "M52, around July 2016";
     case 53:
         return "M53, around September 2016";
+    case 54:
+        return "M54, around October 2016";
     }
 
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 static String replacedBy(const char* feature, const char* replacement)
 {
     return String::format("%s is deprecated. Please use %s instead.", feature, replacement);
 }
@@ skipping 198 matching lines @@
 
     case UseCounter::BorderImageWithBorderStyleNone:
         return "Elements using the 'border-image' CSS property with no 'border-style' set should have no border, but currently do. Setting 'border-style' will be required in M51, around May 2016. See https://www.chromestatus.com/features/5542503914668032 for more details.";
 
     case UseCounter::WebAnimationHyphenatedProperty:
         return replacedWillBeRemoved("Hyphenated naming in Web Animations keyframes", "camelCase", 51, "5650817352728576");
 
     case UseCounter::PresentationConnectionStateChangeEventListener:
         return replacedWillBeRemoved("'PresentationConnection.onstateachange'", "'PresentationConnection.on{connect,close,terminate}'", 51, "5662456714100736");
 
+    case UseCounter::HTMLKeygenElement:
+        return willBeRemoved("The <keygen> element", 54, "5716060992962560");
+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();
     }
 }
 
 } // namespace blink