Oilpan: improve fast/workers/worker-document-leak.html stability.

LayoutTests/fast/workers/resources/worker-util.js

 // Useful utilities for worker tests
 
 function log(message)
 {
     document.getElementById("result").innerHTML += message + "<br>";
 }
 
-function gc(forceAlloc)
-{
-    if (typeof GCController !== "undefined")
-        GCController.collect();
-
-    if (typeof GCController == "undefined" || forceAlloc) {
-        function gcRec(n) {
-            if (n < 1)
-                return {};
-            var temp = {i: "ab" + i + (i / 100000)};
-            temp += "foo";
-            gcRec(n-1);
-        }
-        for (var i = 0; i < 1000; i++)
-            gcRec(10)
-    }
-}
-
 function waitUntilWorkerThreadsExit(callback)
 {
     waitUntilThreadCountMatches(callback, 0);
 }
 
 function waitUntilThreadCountMatches(callback, count)
 {
     // When running in a browser, just wait for one second then call the callback.
     if (!window.testRunner) {
-        setTimeout(function() { gc(true); callback(); }, 1000);
+        setTimeout(function() { gc(); callback(); }, 1000);
         return;
     }
 
     if (internals.workerThreadCount == count) {
         // Worker threads have exited.
         callback();
     } else {
         // Poll until worker threads have been GC'd/exited.
         // Force a GC with a bunch of allocations to try to scramble the stack and force worker objects to be collected.
         gc(true);
@@ skipping 15 matching lines @@
         debug('<br><span class="pass">TEST COMPLETE</span>');
     else
         log("DONE");
 
     // Call notifyDone via the queue so any pending console messages/exceptions are written out first.
     setTimeout(function() {
         if (window.testRunner)
             testRunner.notifyDone();
     }, 0);
 }