android-kitkat-arm-rel crashed in org.chromium.chrome.browser.offlinepages.MHTMLPageTest#testDownloadMultipartRelatedPageFromServer.

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/android-kitkat-arm-rel/9596

java.lang.NullPointerException
  at org.chromium.chrome.browser.download.SystemDownloadNotifier2.updateNotification(SystemDownloadNotifier2.java:247)
  at org.chromium.chrome.browser.download.SystemDownloadNotifier2.addPendingNotification(SystemDownloadNotifier2.java:202)
  at org.chromium.chrome.browser.download.SystemDownloadNotifier2.notifyDownloadSuccessful(SystemDownloadNotifier2.java:135)
  at org.chromium.chrome.browser.download.DownloadManagerService$1.onPostExecute(DownloadManagerService.java:554)
  at org.chromium.chrome.browser.download.DownloadManagerService$1.onPostExecute(DownloadManagerService.java:539)
  at org.chromium.base.AsyncTask.finish(AsyncTask.java:633)
  at org.chromium.base.AsyncTask.lambda$postResult$0$AsyncTask(AsyncTask.java:394)
  at org.chromium.base.AsyncTask$$Lambda$0.run(AsyncTask.java)
  at android.os.Handler.handleCallback(Handler.java:733)
  at android.os.Handler.dispatchMessage(Handler.java:95)
  at android.os.Looper.loop(Looper.java:136)
  at android.app.ActivityThread.main(ActivityThread.java:5001)
  at java.lang.reflect.Method.invokeNative(Method.java)
  at java.lang.reflect.Method.invoke(Method.java:515)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
  at dalvik.system.NativeStart.main(NativeStart.java)