Bug 1426797 - Mark image-size.xul as random on Windows. a=test-only

--HG--
extra : rebase_source : 6a247228bc12ebfb112cb92845f6c2073de6a5fa

layout/xul/reftest/reftest.list

@@ -1,7 +1,7 @@
 fails-if(Android) == textbox-multiline-noresize.xul textbox-multiline-ref.xul # reference is blank on Android (due to no native theme support?)
 != textbox-multiline-resize.xul textbox-multiline-ref.xul
 == popup-explicit-size.xul popup-explicit-size-ref.xul
-random-if(Android) fuzzy-if(webrender,128-128,168-168) == image-size.xul image-size-ref.xul
+random-if(Android||winWidget) fuzzy-if(webrender,128-128,168-168) == image-size.xul image-size-ref.xul # Bug 1426797
 == image-scaling-min-height-1.xul image-scaling-min-height-1-ref.xul
 == textbox-text-transform.xul textbox-text-transform-ref.xul