[Devtools] Fixed bug with NetworkLog depending on ResourceTreeModel

third_party/WebKit/Source/devtools/front_end/sdk/NetworkLog.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 /**
  * @unrestricted
  */
 SDK.NetworkLog = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
-   * @param {!SDK.ResourceTreeModel} resourceTreeModel
+   * @param {?SDK.ResourceTreeModel} resourceTreeModel
    * @param {!SDK.NetworkManager} networkManager
    */
   constructor(target, resourceTreeModel, networkManager) {
     super(SDK.NetworkLog, target);
 
     this._requests = [];
     this._requestForId = {};
     networkManager.addEventListener(SDK.NetworkManager.Events.RequestStarted, this._onRequestStarted, this);
-    resourceTreeModel.addEventListener(
-        SDK.ResourceTreeModel.Events.MainFrameNavigated, this._onMainFrameNavigated, this);
-    resourceTreeModel.addEventListener(SDK.ResourceTreeModel.Events.Load, this._onLoad, this);
-    resourceTreeModel.addEventListener(SDK.ResourceTreeModel.Events.DOMContentLoaded, this._onDOMContentLoaded, this);
+    if (resourceTreeModel) {
+      resourceTreeModel.addEventListener(
+          SDK.ResourceTreeModel.Events.MainFrameNavigated, this._onMainFrameNavigated, this);
+      resourceTreeModel.addEventListener(SDK.ResourceTreeModel.Events.Load, this._onLoad, this);
+      resourceTreeModel.addEventListener(SDK.ResourceTreeModel.Events.DOMContentLoaded, this._onDOMContentLoaded, this);
+    }
   }
 
   /**
    * @param {!SDK.Target} target
    * @return {?SDK.NetworkLog}
    */
   static fromTarget(target) {
     return /** @type {?SDK.NetworkLog} */ (target.model(SDK.NetworkLog));
   }
 
@@ skipping 116 matching lines @@
    * @param {!SDK.NetworkRequest} mainRequest
    */
   constructor(mainRequest) {
     this.id = ++SDK.PageLoad._lastIdentifier;
     this.url = mainRequest.url;
     this.startTime = mainRequest.startTime;
   }
 };
 
 SDK.PageLoad._lastIdentifier = 0;