DevTools: enable private field checks as a part of compilation.

third_party/WebKit/Source/devtools/front_end/timeline/MemoryCountersGraph.js

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
         Common.UIString('GPU Memory'), Common.UIString('GPU Memory [KB]: %s'), 'hsl(300, 90%, 43%)',
         Number.bytesToString);
     this._countersByName['gpuMemoryUsedKB'] = this._gpuMemoryCounter;
   }
 
   /**
    * @override
    */
   refreshRecords() {
     this.reset();
-    var events = this._model.mainThreadEvents();
+    var events = this.model().mainThreadEvents();
     for (var i = 0; i < events.length; ++i) {
       var event = events[i];
       if (event.name !== TimelineModel.TimelineModel.RecordType.UpdateCounters)
         continue;
 
       var counters = event.args.data;
       if (!counters)
         return;
       for (var name in counters) {
         var counter = this._countersByName[name];
         if (counter)
           counter.appendSample(event.startTime, counters[name]);
       }
 
       var gpuMemoryLimitCounterName = 'gpuMemoryLimitKB';
       if (gpuMemoryLimitCounterName in counters)
         this._gpuMemoryCounter.setLimit(counters[gpuMemoryLimitCounterName]);
     }
     this.scheduleRefresh();
   }
 };