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

third_party/WebKit/Source/devtools/front_end/animation/AnimationTimeline.js

 // Copyright (c) 2015 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.VBox}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.AnimationTimeline = function()
@@ skipping 127 matching lines @@
             var button = playbackRateControl.createChild("div", "animation-playback-rate-button");
             button.textContent = playbackRate ? WebInspector.UIString(playbackRate * 100 + "%") : WebInspector.UIString("Pause");
             button.playbackRate = playbackRate;
             button.addEventListener("click", this._setPlaybackRate.bind(this, playbackRate));
             button.title = WebInspector.UIString("Set speed to ") + button.textContent;
             this._playbackRateButtons.push(button);
         }
         this._updatePlaybackControls();
 
         this._previewContainer = this.contentElement.createChild("div", "animation-timeline-buffer");
-        this._popoverHelper = new WebInspector.PopoverHelper(this._previewContainer, this._getPopoverAnchor.bind(this), this._showPopover.bind(this), this._onHidePopover.bind(this), true);
+        this._popoverHelper = new WebInspector.PopoverHelper(this._previewContainer, true);
+        this._popoverHelper.initializeCallbacks(this._getPopoverAnchor.bind(this), this._showPopover.bind(this), this._onHidePopover.bind(this));
         this._popoverHelper.setTimeout(0);
         var emptyBufferHint = this.contentElement.createChild("div", "animation-timeline-buffer-hint");
         emptyBufferHint.textContent = WebInspector.UIString("Listening for animations...");
         var container = this.contentElement.createChild("div", "animation-timeline-header");
         var controls = container.createChild("div", "animation-controls");
         this._currentTime = controls.createChild("div", "animation-timeline-current-time monospace");
 
         var toolbar = new WebInspector.Toolbar("animation-controls-toolbar", controls);
         this._controlButton = new WebInspector.ToolbarButton(WebInspector.UIString("Replay timeline"), "animation-control-toolbar-item");
         this._controlButton.setState(WebInspector.AnimationTimeline._ControlState.Replay);
@@ skipping 604 matching lines @@
  */
 WebInspector.AnimationTimeline.StepTimingFunction.parse = function(text) {
     var match = text.match(/^steps\((\d+), (start|middle)\)$/);
     if (match)
         return new WebInspector.AnimationTimeline.StepTimingFunction(parseInt(match[1], 10), match[2]);
     match = text.match(/^steps\((\d+)\)$/);
     if (match)
         return new WebInspector.AnimationTimeline.StepTimingFunction(parseInt(match[1], 10), "end");
     return null;
 };