Cleanup LayoutTests that define a function gc().

third_party/WebKit/LayoutTests/fast/events/message-channel-gc-3.html

Index: third_party/WebKit/LayoutTests/fast/events/message-channel-gc-3.html
diff --git a/third_party/WebKit/LayoutTests/fast/events/message-channel-gc-3.html b/third_party/WebKit/LayoutTests/fast/events/message-channel-gc-3.html
index 29577c44a8e8b2aac7309399cf8c2d9a637cd067..c33e2f6e5857526556acd2f72ce982ccc86efeb9 100644
--- a/third_party/WebKit/LayoutTests/fast/events/message-channel-gc-3.html
+++ b/third_party/WebKit/LayoutTests/fast/events/message-channel-gc-3.html
@@ -2,16 +2,8 @@
 <p>Test that MessagePort messages are delivered even if both ports are inaccessible from JS any more.</p>
 <p>Should say PASS twice.</p>
 <pre id=log></pre>
+<script src="../../resources/gc.js"></script>
 <script>
-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 log(message)
 {