Remove early returns in fullscreen tests

LayoutTests/fullscreen/full-screen-stacking-context.html

Index: LayoutTests/fullscreen/full-screen-stacking-context.html
diff --git a/LayoutTests/fullscreen/full-screen-stacking-context.html b/LayoutTests/fullscreen/full-screen-stacking-context.html
index a3750ed9e6613aa24915f2f84cd9e5bb3b06a02c..5d3f677293f7dec32ed843bfa8fc7b6906d632a8 100644
--- a/LayoutTests/fullscreen/full-screen-stacking-context.html
+++ b/LayoutTests/fullscreen/full-screen-stacking-context.html
@@ -5,14 +5,8 @@
             var runPixelTests = true;
             
             function init() {
-                // Bail out early if the full screen API is not enabled or is missing:
-                if (Element.prototype.webkitRequestFullScreen == undefined) {
-                    logResult(false, "Element.prototype.webkitRequestFullScreen == undefined");
-                    endTest();
-                } else {
-                    waitForEventAndEnd(document, 'webkitfullscreenchange');
-                    runWithKeyDown(goFullScreen);
-                }
+                waitForEventAndEnd(document, 'webkitfullscreenchange');
+                runWithKeyDown(goFullScreen);
             }
             
             function goFullScreen() {