Use GCController.collectAll() in gc()

LayoutTests/resources/js-test.js

 // svg/dynamic-updates tests set enablePixelTesting=true, as we want to dump text + pixel results
 if (self.testRunner) {
     if (self.enablePixelTesting)
         testRunner.dumpAsTextWithPixelResults();
     else
         testRunner.dumpAsText();
 }
 
 var description, debug, successfullyParsed;
 
@@ skipping 633 matching lines @@
             testFailed("Unexpected error '" + message + "'");
         expectedErrorMessage = undefined;
         return;
     }
 
     testFailed("expectError() not called before shouldHaveHadError()");
 }
 
 function gc() {
     if (typeof GCController !== "undefined")
-        GCController.collect();
+        GCController.collectAll();
     else {
         var gcRec = function (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);
@@ skipping 100 matching lines @@
     testPassed = function(msg) {
         workerPort.postMessage('PASS:' + msg);
     };
     finishJSTest = function() {
         workerPort.postMessage('DONE:');
     };
     debug = function(msg) {
         workerPort.postMessage(msg);
     };
 }