[Devtools] NetworkLogView now uses NetworkLog as source of truth.

third_party/WebKit/Source/devtools/front_end/network/NetworkFrameGrouper.js

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @implements {Network.GroupLookupInterface}
  */
 Network.NetworkFrameGrouper = class {
   /**
    * @param {!Network.NetworkLogView} parentView
    */
   constructor(parentView) {
     this._parentView = parentView;
-    /** @type {!Map<!SDK.ResourceTreeFrame, !Network.FrameGroupNode>} */
-    this._activeGroups = new Map();
+    this._frameGroupNodeSymbol = Symbol('FrameGroupNode');

[allada, 2017/06/08 21:24:25]

I needed to change this because a frame may now go away and we no longer clear
everything and now instead get notified about requests that were removed which
makes calling reset() difficult. To make it easier I let the garbage collector
deal with it.

   }
 
   /**
    * @override
    * @param {!SDK.NetworkRequest} request
    * @return {?Network.NetworkGroupNode}
    */
   groupNodeForRequest(request) {
     var frame = SDK.ResourceTreeModel.frameForRequest(request);
     if (!frame || frame.isMainFrame())
       return null;
-    var groupNode = this._activeGroups.get(frame);
+    var groupNode = frame[this._frameGroupNodeSymbol];
     if (groupNode)
       return groupNode;
     groupNode = new Network.FrameGroupNode(this._parentView, frame);
-    this._activeGroups.set(frame, groupNode);
+    frame[this._frameGroupNodeSymbol] = groupNode;
     return groupNode;
   }
-
-  /**
-   * @override
-   */
-  reset() {
-    this._activeGroups.clear();
-  }
 };
 
 Network.FrameGroupNode = class extends Network.NetworkGroupNode {
   /**
    * @param {!Network.NetworkLogView} parentView
    * @param {!SDK.ResourceTreeFrame} frame
    */
   constructor(parentView, frame) {
     super(parentView);
     this._frame = frame;
@@ skipping 29 matching lines @@
         this._productBadge = this.parentView().badgePool.badgeForFrame(this._frame);
         this._productBadge.classList.add('network-frame-group-badge');
       }
       cell.appendChild(UI.Icon.create('largeicon-navigator-frame', 'network-frame-group-icon'));
       cell.appendChild(this._productBadge);
       cell.createTextChild(name);
       cell.title = name;
     }
   }
 };