Bug 1268749 part 3 - Hide :fullscreen pseudo-class from content when unprefixed API is disabled. r=heycam

MozReview-Commit-ID: 78hlOGCDKn0

--HG--
extra : rebase_source : 3fbdf8fcde0064316b821d1ffde98e9e3f8185a1

layout/style/nsCSSPseudoClassList.h

@@ -161,7 +161,10 @@ CSS_STATE_PSEUDO_CLASS(mozDevtoolsHighlighted, ":-moz-devtools-highlighted", 0,
 
 // Matches the element which is being displayed full-screen, and
 // any containing frames.
-CSS_STATE_PSEUDO_CLASS(fullscreen, ":fullscreen", 0, "", NS_EVENT_STATE_FULL_SCREEN)
+CSS_STATE_PSEUDO_CLASS(fullscreen, ":fullscreen",
+                       CSS_PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME,
+                       "full-screen-api.unprefix.enabled",
+                       NS_EVENT_STATE_FULL_SCREEN)
 CSS_STATE_PSEUDO_CLASS(mozFullScreen, ":-moz-full-screen", 0, "", NS_EVENT_STATE_FULL_SCREEN)
 
 // Matches any element which is an ancestor of the DOM full-screen element,