Remove early returns in fullscreen tests

LayoutTests/fullscreen/full-screen-iframe-zIndex.html

Index: LayoutTests/fullscreen/full-screen-iframe-zIndex.html
diff --git a/LayoutTests/fullscreen/full-screen-iframe-zIndex.html b/LayoutTests/fullscreen/full-screen-iframe-zIndex.html
index 7ea3e94252c66038f5aa3b0b7660f9145b9d84af..44b5afde09901d48b907bbc3c1ffae1bb0ea1a6e 100644
--- a/LayoutTests/fullscreen/full-screen-iframe-zIndex.html
+++ b/LayoutTests/fullscreen/full-screen-iframe-zIndex.html
@@ -5,16 +5,10 @@
             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 {
-                    var iframe = document.getElementById('block1');
-                    var element = iframe.contentDocument.documentElement;
-                    waitForEventAndEnd(element, 'webkitfullscreenchange');
-                    runWithKeyDown(goFullScreen);
-                }
+                var iframe = document.getElementById('block1');
+                var element = iframe.contentDocument.documentElement;
+                waitForEventAndEnd(element, 'webkitfullscreenchange');
+                runWithKeyDown(goFullScreen);
             }
 
             function goFullScreen() {