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

BUG=397216

Review URL: https://codereview.chromium.org/414233002

git-svn-id: svn://svn.chromium.org/blink/trunk@179148 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -175,7 +175,6 @@ WebInspector.TimelineModelImpl.prototype = {
         if (cpuProfile)
             WebInspector.TimelineJSProfileProcessor.mergeJSProfileIntoTimeline(this, cpuProfile);
         this.dispatchEventToListeners(WebInspector.TimelineModel.Events.RecordingStopped);
-        this._currentTarget = null;
     },
 
     /**
@@ -272,6 +271,8 @@ WebInspector.TimelineModelImpl.prototype = {
 
     reset: function()
     {
+        if (!this._collectionEnabled)
+            this._currentTarget = null;
         this._payloads = [];
         this._stringPool = {};
         this._bindings._reset();