Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

LayoutTests/fast/dom/document-softleak-mouse-navigation.html

Index: LayoutTests/fast/dom/document-softleak-mouse-navigation.html
diff --git a/LayoutTests/fast/dom/document-softleak-mouse-navigation.html b/LayoutTests/fast/dom/document-softleak-mouse-navigation.html
index f339d2b5f3fd0722b8d8fd968e4b09559a56d970..91b679632d24ca5d3a8e2b461de9f35f1ffdd895 100644
--- a/LayoutTests/fast/dom/document-softleak-mouse-navigation.html
+++ b/LayoutTests/fast/dom/document-softleak-mouse-navigation.html
@@ -11,19 +11,18 @@ var countersBefore;
 var iframe = document.getElementById("target");
 
 function onAboutBlankLoad() {
-    setTimeout(function() {
-        countersBefore = getCounterValues();
+    getCounterValues(function (counters) {
+        countersBefore = counters;
         iframe.onload = null;
         iframe.src = "resources/link.html";
-    }, 0);
+    });
 }
 
 function onDone() {
-    setTimeout(function() {
-        var countersAfter = getCounterValues();
+    getCounterValues(function (countersAfter) {
         compareValues(countersBefore, countersAfter, {'numberOfLiveDocuments': 0});
         finishJSTest();
-    }, 0); 
+    });
 }
 
 iframe.onload = onAboutBlankLoad;