Move divider detection and creation onto TimelineUIUtils instance

Source/devtools/front_end/timeline/TimelineModelImpl.js

 // Copyright 2014 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.TimelineModel}
  * @param {!WebInspector.TimelineManager} timelineManager
  */
 WebInspector.TimelineModelImpl = function(timelineManager)
@@ skipping 150 matching lines @@
     },
 
     /**
      * @param {!TimelineAgent.TimelineEvent} payload
      * @param {?WebInspector.TimelineModel.Record} parentRecord
      * @return {!WebInspector.TimelineModel.Record}
      */
     _innerAddRecord: function(payload, parentRecord)
     {
         var record = new WebInspector.TimelineModel.RecordImpl(this, payload, parentRecord);
-        if (WebInspector.TimelineUIUtils.isEventDivider(record))
+        if (WebInspector.TimelineUIUtilsImpl.isEventDivider(record))
             this._eventDividerRecords.push(record);
 
         for (var i = 0; payload.children && i < payload.children.length; ++i)
             this._innerAddRecord.call(this, payload.children[i], record);
 
         record._calculateAggregatedStats();
         if (parentRecord)
             parentRecord._selfTime -= record.endTime() - record.startTime();
         return record;
     },
@@ skipping 568 matching lines @@
                 break;
             length += itemLength;
             data.push(item);
             ++this._recordIndex;
         }
         if (this._recordIndex === this._payloads.length)
             data.push(data.pop() + "]");
         stream.write(data.join(separator), this._writeNextChunk.bind(this));
     }
 }