Adding Deprecation Message for <keygen>

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 3d401623b158f9ce3fb0ccc6f73fbc3272f7f45c..8254910ac8270e33f619aa0d055cbf17a4642c78 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -342,6 +342,9 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
     case UseCounter::SVGZoomEvent:
         return willBeRemoved("'SVGZoomEvent'", 52, "5760883808534528");
 
+    case UseCounter::HTMLKeygenElement:
+        return "The <keygen> element is deprecated and will be removed.";

[jochen (gone - plz use gerrit), 2016/02/23 15:23:30]

please use the willBeRemoved() method to construct the message

[svaldez, 2016/02/23 15:35:47]

The removal timeline is still slightly rough, though the hope is to remove in
54/55.

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