Initialize min/max record time to 0 instead of -1 or null

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 186 matching lines @@
         this._detailsView.setVertical(vertically);
     },
 
     /**
      * @return {number}
      */
     windowStartTime: function()
     {
         if (this._windowStartTime)
             return this._windowStartTime;
-        var minimumRecordTime = this._model.minimumRecordTime();
-        if (minimumRecordTime && minimumRecordTime != -1)
-            return minimumRecordTime;
-        return 0;
+        return this._model.minimumRecordTime();
     },
 
     /**
      * @return {number}
      */
     windowEndTime: function()
     {
         if (this._windowEndTime < Infinity)
             return this._windowEndTime;
-        var maximumRecordTime = this._model.maximumRecordTime();
-        if (maximumRecordTime && maximumRecordTime != -1)
-            return maximumRecordTime;
-        return Infinity;
+        return this._model.maximumRecordTime() || Infinity;
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _sidebarResized: function(event)
     {
         var width = /** @type {number} */ (event.data);
         this._topPane.setSidebarSize(width);
         for (var i = 0; i < this._currentViews.length; ++i)
@@ skipping 1192 matching lines @@
      * @param {!WebInspector.TimelineModel.Record} record
      * @return {boolean}
      */
     accept: function(record)
     {
         return !this._hiddenRecords[record.type()];
     },
 
     __proto__: WebInspector.TimelineModel.Filter.prototype
 }