DevTools: Clear current target in TimelineModelImpl's reset only if timeline is not recording

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}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.TimelineModelImpl = function()
@@ skipping 148 matching lines @@
     /**
      * @param {?Protocol.Error} error
      * @param {?ProfilerAgent.CPUProfile} cpuProfile
      */
     _fireRecordingStopped: function(error, cpuProfile)
     {
         this._collectionEnabled = false;
         if (cpuProfile)
             WebInspector.TimelineJSProfileProcessor.mergeJSProfileIntoTimeline(this, cpuProfile);
         this.dispatchEventToListeners(WebInspector.TimelineModel.Events.RecordingStopped);
-        this._currentTarget = null;
     },
 
     /**
      * @param {!TimelineAgent.TimelineEvent} payload
      */
     _addRecord: function(payload)
     {
         this._internStrings(payload);
         this._payloads.push(payload);
 
@@ skipping 76 matching lines @@
             if (!accepted)
                 return;
             var saver = new WebInspector.TimelineSaver(stream);
             saver.save(this._payloads, window.navigator.appVersion);
         }
         stream.open(fileName, callback.bind(this));
     },
 
     reset: function()
     {
+        if (!this._collectionEnabled)
+            this._currentTarget = null;
         this._payloads = [];
         this._stringPool = {};
         this._bindings._reset();
         WebInspector.TimelineModel.prototype.reset.call(this);
     },
 
     /**
      * @param {!TimelineAgent.TimelineEvent} record
      */
     _internStrings: function(record)
@@ skipping 451 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));
     }
 }