DevTools: do not allow using 'this' before call into super.

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

 // Copyright 2014 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.
 
 /**
  * @constructor
  * @extends {WebInspector.ProfileNode}
  * @param {!ProfilerAgent.ProfileNode} node
  * @param {number} sampleTime
  */
@@ skipping 19 matching lines @@
     __proto__: WebInspector.ProfileNode.prototype
 };
 
 /**
  * @constructor
  * @extends {WebInspector.ProfileTreeModel}
  * @param {!ProfilerAgent.Profile} profile
  */
 WebInspector.CPUProfileDataModel = function(profile)
 {
+    WebInspector.ProfileTreeModel.call(this);
     var isLegacyFormat = !!profile["head"];
     if (isLegacyFormat) {
         // Legacy format contains raw timestamps and start/stop times are in seconds.
         this.profileStartTime = profile.startTime * 1000;
         this.profileEndTime = profile.endTime * 1000;
         this.timestamps = profile.timestamps;
         this._compatibilityConversionHeadToNodes(profile);
     } else {
         // Current format encodes timestamps as deltas. Start/stop times are in microseconds.
         this.profileStartTime = profile.startTime / 1000;
         this.profileEndTime = profile.endTime / 1000;
         this.timestamps = this._convertTimeDeltas(profile);
     }
     this.samples = profile.samples;
     this.totalHitCount = 0;
     this.profileHead = this._translateProfileTree(profile.nodes);
-    WebInspector.ProfileTreeModel.call(this, this.profileHead);
+    this.initialize(this.profileHead);
     this._extractMetaNodes();
     if (this.samples) {
         this._buildIdToNodeMap();
         this._sortSamples();
         this._normalizeTimestamps();
     }
 };
 
 WebInspector.CPUProfileDataModel.prototype = {
     /**
@@ skipping 301 matching lines @@
      * @param {number} index
      * @return {?WebInspector.CPUProfileNode}
      */
     nodeByIndex: function(index)
     {
         return this._idToNode.get(this.samples[index]) || null;
     },
 
     __proto__: WebInspector.ProfileTreeModel.prototype
 };