Cleanup LayoutTests that define a function gc().

third_party/WebKit/LayoutTests/fast/dom/Window/timer-null-script-execution-context.html

Index: third_party/WebKit/LayoutTests/fast/dom/Window/timer-null-script-execution-context.html
diff --git a/third_party/WebKit/LayoutTests/fast/dom/Window/timer-null-script-execution-context.html b/third_party/WebKit/LayoutTests/fast/dom/Window/timer-null-script-execution-context.html
index aa4f66cffa12e7e6730374e8b49f7e235f22e88b..adee002163b490073a50e716bc509a632be31900 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/Window/timer-null-script-execution-context.html
+++ b/third_party/WebKit/LayoutTests/fast/dom/Window/timer-null-script-execution-context.html
@@ -2,24 +2,13 @@
 <p>Test for <a href="https://bugs.webkit.org/show_bug.cgi?id=33815">bug 33815</a>: Crash when using DOMTimer from a detached frame.</p>
 <p>Pass if no crash.</p>
 <iframe src="about:blank"></iframe>
-
+<script src="../../../resources/gc.js"></script>
 <script>
 if (window.testRunner) {
     testRunner.dumpAsText();
     testRunner.waitUntilDone();
 }
 
-function gc()
-{
-    if (window.GCController)
-        return GCController.collect();
-
-    for (var i = 0; i < 10000; i++) { // > force garbage collection (FF requires about 9K allocations before a collect)
-        var s = new String("");
-    }
-}
-
-
 function test()
 {
     var w = frames[0];