[DevTools] Fix more frontend compiler errors

third_party/WebKit/Source/devtools/front_end/timeline/LayerTreeModel.js

Index: third_party/WebKit/Source/devtools/front_end/timeline/LayerTreeModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/LayerTreeModel.js b/third_party/WebKit/Source/devtools/front_end/timeline/LayerTreeModel.js
index a22642d052c35ff1291c4572b5c17ea9de2c9591..ee864f35f43ce20f6d8d8132613e8cd280497f55 100644
--- a/third_party/WebKit/Source/devtools/front_end/timeline/LayerTreeModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/timeline/LayerTreeModel.js
@@ -265,7 +265,7 @@ WebInspector.LayerTreeBase.prototype = {
         {
             if (nodesMap) {
                 for (var entry of nodesMap)

[lushnikov, 2016/03/04 22:49:18]

.keys()?

[kozy, 2016/03/04 23:18:50]

Done.

-                    this._backendNodeIdToNode.set(entry[0], entry[1]);
+                    this._backendNodeIdToNode.set(/** @type {number} */(entry[0]), /** @type {?WebInspector.DOMNode} */(entry[1]));
             }
             callback();
         }
@@ -382,7 +382,7 @@ WebInspector.TracingLayerTree.prototype = {
     _extractNodeIdsToResolve: function(nodeIdsToResolve, seenNodeIds, payload)
     {
         var backendNodeId = payload.owner_node;
-        if (backendNodeId && !this._backendNodeIdToNode[backendNodeId])
+        if (backendNodeId && !this._backendNodeIdToNode.has(backendNodeId))
             nodeIdsToResolve.add(backendNodeId);
         for (var i = 0; payload.children && i < payload.children.length; ++i)
             this._extractNodeIdsToResolve(nodeIdsToResolve, seenNodeIds, payload.children[i]);