Align -webkit-transform-origin behaviour with transform-origin behaviour

LayoutTests/fast/css/transform-inline-style-remove-expected.txt

 Tests Removing inline style for transition, animation and transform origin
 https://bugs.webkit.org/show_bug.cgi?id=22605
 
 All "after" results should be null/empty
 
 transition (before): all 1s ease, left 3s cubic-bezier(0.2, 0.3, 0.6, 0.8) 2s
 transition property (before): all, left
 transition duration (before): 1s, 3s
 transition timing function (before): ease, cubic-bezier(0.2, 0.3, 0.6, 0.8)
 transition (after): 
 transition property (after): 
 transition duration (after): 
 transition timing function (after): 
 
-transform origin (before): 0% 30%
-transform origin X (before): 0%
-transform origin Y (before): 30%
+transform origin (before): left 30% 0px
+transform origin X (before): 
+transform origin Y (before): 
 transform origin (after): 
 transform origin X (after): 
 transform origin Y (after): 
 
 animation (before): test 5s ease-in-out infinite alternate
 animation name (before): test
 animation duration (before): 5s
 animation timing function (before): ease-in-out
 animation direction (before): alternate
 animation iteration count (before): infinite
 animation (after): 
 animation name (after): 
 animation duration (after): 
 animation timing function (after): 
 animation direction (after): 
 animation iteration count (after):