Cleanup LayoutTests that define a function gc().

third_party/WebKit/LayoutTests/fast/media/lifetime.html

Index: third_party/WebKit/LayoutTests/fast/media/lifetime.html
diff --git a/third_party/WebKit/LayoutTests/fast/media/lifetime.html b/third_party/WebKit/LayoutTests/fast/media/lifetime.html
index b9ef342ad514cb3faec8038cbfead425067a6407..ac2b2563c5b85263c055afd193d2a9442063c990 100644
--- a/third_party/WebKit/LayoutTests/fast/media/lifetime.html
+++ b/third_party/WebKit/LayoutTests/fast/media/lifetime.html
@@ -2,22 +2,13 @@
 <p>Test Media object lifetime.</p>
 <div id=result>Testing...</div>
 <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("abc");
-    }
-}
-
 function test()
 {
     if (!window.styleMedia) {