Looks falling in DownloadManagerService.

org.chromium.chrome.browser.contextmenu.ContextMenuTest#testSaveDataUrl (run #1):
java.lang.RuntimeException: An error occured while executing doInBackground()
	at android.os.AsyncTask$3.done(AsyncTask.java:300)
	at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
	at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
	at java.util.concurrent.FutureTask.run(FutureTask.java:242)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
	at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.lang.Void[]
	at org.chromium.chrome.browser.download.DownloadManagerService$2.doInBackground(DownloadManagerService.java:665)
	at android.os.AsyncTask$2.call(AsyncTask.java:288)
	at java.util.concurrent.FutureTask.run(FutureTask.java:237)
	... 3 more

I think this CL caused this failures.
https://codereview.chromium.org/2502793002

Created a revert CL: https://codereview.chromium.org/2500323002/

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/350925bf0e87c2111322453618c95447f9781a03

commit 350925bf0e87c2111322453618c95447f9781a03
Author: horo <horo@chromium.org>
Date: Tue Nov 15 05:41:40 2016

Revert of Fix a crash when AsyncTask cannot be scheduled while posting notification updates (patchset #2 id:20001 of https://codereview.chromium.org/2502793002/ )

Reason for revert:
Caused test failures.
See  http://crbug.com/665257 

BUG= 665257 

Original issue's description:
> Fix a crash when AsyncTask cannot be scheduled while posting notification updates
>
> When posting notification updates, it is possible that chrome reaches the thread limit and AsyncTask will fail.
> In that case, we should delay the updates to next update.
>
> BUG=664928
>
> Committed: https://crrev.com/120deee008d677fc7fd4a36d070681bbe380566c
> Cr-Commit-Position: refs/heads/master@{#431934}

TBR=dfalcantara@chromium.org,qinmin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=664928

Review-Url: https://codereview.chromium.org/2500323002
Cr-Commit-Position: refs/heads/master@{#432118}

[modify] https://crrev.com/350925bf0e87c2111322453618c95447f9781a03/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadManagerService.java

Reopenning, saw more failures today: https://uberchromegw.corp.google.com/i/chromium.linux/builders/Android%20Tests%20%28dbg%29/builds/37461

Apparently the patch relanded some time ago. Should we re-revert?

No failures of these tests. Mark as fixed.