Remove unused HTML attribute names

Source/core/html/HTMLAttributeNames.in

Index: Source/core/html/HTMLAttributeNames.in
diff --git a/Source/core/html/HTMLAttributeNames.in b/Source/core/html/HTMLAttributeNames.in
index 8c947f69942b5fcf54f6f07b2f91adde2280e99c..8a17e583fcca37fc8ddeef31ea21b80eaf1b628a 100644
--- a/Source/core/html/HTMLAttributeNames.in
+++ b/Source/core/html/HTMLAttributeNames.in
@@ -37,14 +37,11 @@ aria-multiline
 aria-multiselectable
 aria-orientation
 aria-owns
-aria-posinset
 aria-pressed
 aria-readonly
 aria-relevant
 aria-required
 aria-selected
-aria-setsize
-aria-sort
 aria-valuemax
 aria-valuemin
 aria-valuenow
@@ -68,7 +65,6 @@ challenge
 charoff
 charset
 checked
-cellborder
 cite
 class
 classid
@@ -95,16 +91,13 @@ dir
 direction
 dirname
 disabled
-disposition
 download
 draggable
 webkitdropzone
 enctype
 end
 event
-expanded
 face
-focused
 for
 form
 formaction
@@ -124,16 +117,10 @@ hspace
 http-equiv
 id
 incremental
-indeterminate
 inputmode
 integrity
 is
 ismap
-itemid
-itemprop
-itemref
-itemscope
-itemtype
 keytype
 kind
 label
@@ -145,9 +132,6 @@ list
 longdesc
 loop
 low
-playcount
-loopend
-loopstart
 lowsrc
 manifest
 marginheight
@@ -246,7 +230,6 @@ onseeking
 onselect
 onselectstart
 onselectionchange
-onwebkitspeechchange
 onshow
 onstalled
 onstorage
@@ -267,28 +250,16 @@ onwebkitanimationiteration
 onwebkitanimationend
 onwebkitfullscreenchange
 onwebkitfullscreenerror
-onwebkitkeyadded
-onwebkitkeyerror
-onwebkitkeymessage
-onwebkitneedkey
-onwebkitsourceclose
-onwebkitsourceended
-onwebkitsourceopen
 onwebkittransitionend
 onwheel
 open
 optimum
 pattern
 placeholder
-pluginspage
-pluginurl
 ping
 poster
 preload
-primary
 profile
-progress
-prompt
 pseudo
 readonly
 rel
@@ -312,8 +283,6 @@ selected
 shape
 size
 sizes
-sortable
-sortdirection
 span
 spellcheck
 src
@@ -326,11 +295,9 @@ step
 style
 summary
 tabindex
-tableborder
 target
 text
 title
-top
 topmargin
 translate
 truespeed