DevTools: Remove unused variables. Disallow unused variables with eslint

third_party/WebKit/Source/devtools/front_end/timeline_model/TimelineIRModel.js

 // Copyright 2016 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.
 /**
  * @unrestricted
  */
 TimelineModel.TimelineIRModel = class {
   constructor() {
     this.reset();
   }
 
   /**
    * @param {!SDK.TracingModel.Event} event
    * @return {!TimelineModel.TimelineIRModel.Phases}
    */
   static phaseForEvent(event) {
     return event[TimelineModel.TimelineIRModel._eventIRPhase];
   }
 
   /**
    * @param {?Array<!SDK.TracingModel.AsyncEvent>} inputLatencies
    * @param {?Array<!SDK.TracingModel.AsyncEvent>} animations
    */
   populate(inputLatencies, animations) {
-    var eventTypes = TimelineModel.TimelineIRModel.InputEvents;
-    var phases = TimelineModel.TimelineIRModel.Phases;
-
     this.reset();
     if (!inputLatencies)
       return;
     this._processInputLatencies(inputLatencies);
     if (animations)
       this._processAnimations(animations);
     var range = new Common.SegmentedRange();
     range.appendRange(this._drags);  // Drags take lower precedence than animation, as we can't detect them reliably.
     range.appendRange(this._cssAnimations);
     range.appendRange(this._scrolls);
@@ skipping 272 matching lines @@
   TouchMove: 'TouchMove',
   TouchStart: 'TouchStart'
 };
 
 TimelineModel.TimelineIRModel._mergeThresholdsMs = {
   animation: 1,
   mouse: 40,
 };
 
 TimelineModel.TimelineIRModel._eventIRPhase = Symbol('eventIRPhase');