DevTools: Calculate user object distances from Window not from NativeContext.

LayoutTests/inspector/profiler/heap-snapshot-containment-show-all.html

Index: LayoutTests/inspector/profiler/heap-snapshot-containment-show-all.html
diff --git a/LayoutTests/inspector/profiler/heap-snapshot-containment-show-all.html b/LayoutTests/inspector/profiler/heap-snapshot-containment-show-all.html
index d497b09ffe2d80688d6e1820402e74ef5b98707e..e7eb8cd5c79929a4ae1085ba1f71dcfeb201f60c 100644
--- a/LayoutTests/inspector/profiler/heap-snapshot-containment-show-all.html
+++ b/LayoutTests/inspector/profiler/heap-snapshot-containment-show-all.html
@@ -64,7 +64,7 @@ function test()
                 var builder = new InspectorTest.HeapSnapshotBuilder();
                 var rootNode = builder.rootNode;
 
-                var gcRootsNode = new InspectorTest.HeapNode("(GC roots)");
+                var gcRootsNode = new InspectorTest.HeapNode("(GC roots)", 0, InspectorTest.HeapNode.Type.synthetic);
                 rootNode.linkNode(gcRootsNode, InspectorTest.HeapEdge.Type.element);
 
                 var globalHandlesNode = new InspectorTest.HeapNode("(Global Handles)");