Remove support for the keygen tag

third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt

Index: third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt
diff --git a/third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt b/third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt
index 9b209bf03472e2547fcca181a09cbf93b239ef41..b147ad6769e59fd966fe53abb9e10d817cbc32d4 100644
--- a/third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt
+++ b/third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt
@@ -1,4 +1,3 @@
-CONSOLE WARNING: line 18: The <keygen> element is deprecated and will be removed in M57, around March 2017. See https://www.chromestatus.com/features/5716060992962560 for more details.
 This test documents all properties on all element instances.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
@@ -664,20 +663,6 @@ html element ins
     property dateTime
 html element kbd
 html element keygen
-    property autofocus
-    property challenge
-    property checkValidity
-    property disabled
-    property form
-    property keytype
-    property labels
-    property name
-    property reportValidity
-    property setCustomValidity
-    property type
-    property validationMessage
-    property validity
-    property willValidate
 html element label
     property control
     property form