Fix ReadingListEntry flaky unittests.

Fix ReadingListEntry flaky unittests.

BUG=658619
Review-Url: https://codereview.chromium.org/2722163002
Cr-Commit-Position: refs/heads/master@{#453902}
Committed: https://chromium.googlesource.com/chromium/src/+/9d86f02c7bc5dd777badfb7c1e675a87e434e5d6

[Olivier, 2017-03-01 10:41:54]

olivierrobin@chromium.org changed reviewers:
+ gambard@chromium.org

[gambard, 2017-03-01 10:52:08]

The CQ bit was checked by gambard@chromium.org

[gambard, 2017-03-01 10:52:08]

lgtm

[commit-bot: I haz the power, 2017-03-01 10:52:27]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-01 11:04:32]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1488365528598250,
"parent_rev": "0a16d63e9fc212b9a4c2e3d01cc036745880f516", "commit_rev":
"9d86f02c7bc5dd777badfb7c1e675a87e434e5d6"}

[commit-bot: I haz the power, 2017-03-01 11:05:05]

Description was changed from

==========
Fix ReadingListEntry flaky unittests.

BUG=658619
==========

to

==========
Fix ReadingListEntry flaky unittests.

BUG=658619

Review-Url: https://codereview.chromium.org/2722163002
Cr-Commit-Position: refs/heads/master@{#453902}
Committed:
https://chromium.googlesource.com/chromium/src/+/9d86f02c7bc5dd777badfb7c1e67...
==========

[commit-bot: I haz the power, 2017-03-01 11:05:06]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/9d86f02c7bc5dd777badfb7c1e67...