[Devtools] Cleanup DataGrid's typecast and identifier naming

third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Anthony Ricaud <rik@webkit.org>
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 1188 matching lines @@
 
     dataGridSorted: function()
     {
         this._highlightNthMatchedRequestForSearch(this._updateMatchCountAndFindMatchIndex(this._currentMatchedRequestNode), false);
 
         if (!Runtime.experiments.isEnabled("canvasNetworkTimeline"))
             return;
 
         this._timelineColumnSortIcon.classList.remove("sort-ascending", "sort-descending");
 
-        if (this._dataGrid.sortColumnIdentifier() === "timeline") {
+        if (this._dataGrid.sortColumnId() === "timeline") {
             if (this._dataGrid.sortOrder() === WebInspector.DataGrid.Order.Ascending)
                 this._timelineColumnSortIcon.classList.add("sort-ascending");
             else
                 this._timelineColumnSortIcon.classList.add("sort-descending");
         }
 
         this._timelineRequestsAreStale = true;
     },
 
     /**
@@ skipping 675 matching lines @@
  * @return {boolean}
  */
 WebInspector.NetworkLogView._requestTimeFilter = function(windowStart, windowEnd, request)
 {
     if (request.issueTime() > windowEnd)
         return false;
     if (request.endTime !== -1 && request.endTime < windowStart)
         return false;
     return true;
 };