Fix private member access violations in profiler module

LayoutTests/inspector/profiler/heap-snapshot-test.js

 var initialize_HeapSnapshotTest = function() {
 
 InspectorTest.createHeapSnapshotMockFactories = function() {
 
 InspectorTest.createJSHeapSnapshotMockObject = function()
 {
     return {
         _rootNodeIndex: 0,
         _nodeTypeOffset: 0,
         _nodeNameOffset: 1,
@@ skipping 11 matching lines @@
         _realNodesLength: 18,
         // Represents the following graph:
         //   (numbers in parentheses indicate node offset)
         //
         //         -> A (3) --ac- C (9) -ce- E(15)
         //       a/   |          /
         //  "" (0)    1    - bc -
         //       b\   v   /
         //         -> B (6) -bd- D (12)
         //
-        _nodes: new Uint32Array([
+        nodes: new Uint32Array([
             0, 0, 2,    //  0: root
             1, 1, 2,    //  3: A
             1, 2, 2,    //  6: B
             1, 3, 1,    //  9: C
             1, 4, 0,    // 12: D
             1, 5, 0]),  // 15: E
-        _containmentEdges: new Uint32Array([
+        containmentEdges: new Uint32Array([
             2,  6, 3,   //  0: shortcut 'a' to node 'A'
             1,  7, 6,   //  3: property 'b' to node 'B'
             0,  1, 6,   //  6: element '1' to node 'B'
             1,  8, 9,   //  9: property 'ac' to node 'C'
             1,  9, 9,   // 12: property 'bc' to node 'C'
             1, 10, 12,  // 15: property 'bd' to node 'D'
             1, 11, 15]),// 18: property 'ce' to node 'E'
-        _strings: ["", "A", "B", "C", "D", "E", "a", "b", "ac", "bc", "bd", "ce"],
+        strings: ["", "A", "B", "C", "D", "E", "a", "b", "ac", "bc", "bd", "ce"],
         _firstEdgeIndexes: new Uint32Array([0, 6, 12, 18, 21, 21, 21]),
         createNode: WebInspector.JSHeapSnapshot.prototype.createNode,
         createEdge: WebInspector.JSHeapSnapshot.prototype.createEdge,
         createRetainingEdge: WebInspector.JSHeapSnapshot.prototype.createRetainingEdge
     };
 };
 
 InspectorTest.createHeapSnapshotMockRaw = function()
 {
     // Effectively the same graph as in createJSHeapSnapshotMockObject,
@@ skipping 667 matching lines @@
         function sortingComplete()
         {
             dataGrid.removeEventListener(WebInspector.HeapSnapshotSortableDataGrid.Events.SortingComplete, sortingComplete, null);
             callback();
         }
         dataGrid.addEventListener(WebInspector.HeapSnapshotSortableDataGrid.Events.SortingComplete, sortingComplete, null);
     }
 };
 
 };