DevTools: ignore weak referenced when calculating dominators for heap snapshot

Source/devtools/front_end/heap_snapshot_worker/HeapSnapshot.js

Index: Source/devtools/front_end/heap_snapshot_worker/HeapSnapshot.js
diff --git a/Source/devtools/front_end/heap_snapshot_worker/HeapSnapshot.js b/Source/devtools/front_end/heap_snapshot_worker/HeapSnapshot.js
index 9d75df1f8cd1c79d61d9997b9c72b83b61c22736..1f2ab3bedeed25b0f8897818bd2f4901bdd0b276 100644
--- a/Source/devtools/front_end/heap_snapshot_worker/HeapSnapshot.js
+++ b/Source/devtools/front_end/heap_snapshot_worker/HeapSnapshot.js
@@ -1558,6 +1558,7 @@ WebInspector.HeapSnapshot.prototype = {
         var edgeTypeOffset = this._edgeTypeOffset;
         var edgeToNodeOffset = this._edgeToNodeOffset;
         var edgeShortcutType = this._edgeShortcutType;
+        var edgeWeakType = this._edgeWeakType;
         var firstEdgeIndexes = this._firstEdgeIndexes;
         var containmentEdges = this.containmentEdges;
         var containmentEdgesLength = this.containmentEdges.length;
@@ -1611,6 +1612,8 @@ WebInspector.HeapSnapshot.prototype = {
                 for (var retainerIndex = beginRetainerIndex; retainerIndex < endRetainerIndex; ++retainerIndex) {
                     var retainerEdgeIndex = retainingEdges[retainerIndex];
                     var retainerEdgeType = containmentEdges[retainerEdgeIndex + edgeTypeOffset];
+                    if (retainerEdgeType === edgeWeakType)
+                        continue;
                     var retainerNodeIndex = retainingNodes[retainerIndex];
                     if (retainerNodeIndex !== rootNodeIndex && retainerEdgeType === edgeShortcutType)
                         continue;