Factor out ShouldIgnoreNavigation and add tests for the function

Factor out ShouldIgnoreNavigation and add tests for the function

BUG=None
TEST=try

Committed: https://crrev.com/41621e339b93300359f34c696a21a3671ec4dae8
Cr-Commit-Position: refs/heads/master@{#428100}

[Yusuke Sato, 2016-10-27 01:23:08]

The CQ bit was checked by yusukes@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-27 01:23:28]

Dry run: 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, 2016-10-27 01:55:57]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-10-27 01:55:58]

Dry run: This issue passed the CQ dry run.

[Yusuke Sato, 2016-10-27 01:58:12]

yusukes@chromium.org changed reviewers:
+ lhchavez@chromium.org

[Yusuke Sato, 2016-10-27 01:58:13]

PTAL

[Luis Héctor Chávez, 2016-10-27 16:10:23]

lgtm

[Yusuke Sato, 2016-10-27 18:52:52]

The CQ bit was checked by yusukes@chromium.org

[commit-bot: I haz the power, 2016-10-27 18:53:16]

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, 2016-10-27 18:59:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-27 19:03:47]

Description was changed from

==========
Factor out ShouldIgnoreNavigation and add tests for the function

BUG=None
TEST=try
==========

to

==========
Factor out ShouldIgnoreNavigation and add tests for the function

BUG=None
TEST=try

Committed: https://crrev.com/41621e339b93300359f34c696a21a3671ec4dae8
Cr-Commit-Position: refs/heads/master@{#428100}
==========

[commit-bot: I haz the power, 2016-10-27 19:03:48]

Patchset 1 (id:??) landed as
https://crrev.com/41621e339b93300359f34c696a21a3671ec4dae8
Cr-Commit-Position: refs/heads/master@{#428100}