[Findit] Modify the handler for fracas input message.

appengine/findit/model/crash/test/fracas_crash_analysis_test.py

 # Copyright 2016 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.
 
 from datetime import datetime
 
 from crash.test.crash_testcase import CrashTestCase
 from model import analysis_status
 from model import result_status
 from model.crash.fracas_crash_analysis import FracasCrashAnalysis
 
 
 class FracasCrashAnalysisTest(CrashTestCase):
   def testComputedProperties(self):
     channel = 'canary'
     platform = 'win'
     signature = 'signature/here'
     FracasCrashAnalysis.Create(channel, platform, signature).put()
     analysis = FracasCrashAnalysis.Get(channel, platform, signature)
     self.assertEqual(channel, analysis.channel)
     self.assertEqual(platform, analysis.platform)
     self.assertEqual(signature, analysis.signature)
 
   def testFracasCrashAnalysisReset(self):
     analysis = FracasCrashAnalysis()
     analysis.versions_to_cpm = {}
     analysis.Reset()
-    self.assertIsNone(analysis.versions_to_cpm)
+    self.assertIsNone(analysis.versions_to_historical)