Remove GetBlockingPool() usage in PrinterCapabilitiesTest.

Remove GetBlockingPool() usage in PrinterCapabilitiesTest.

The function being tested only cares about enforcing ThreadRestrictions
now. Since the unit test does not enforce ThreadRestrictions, just call
the function being tested.

Also put the test in the printing namespace.

BUG=667892
Review-Url: https://codereview.chromium.org/2959823003
Cr-Commit-Position: refs/heads/master@{#482714}
Committed: https://chromium.googlesource.com/chromium/src/+/7d380bea073931bcc05118e861ffe2d8fe0d9403

[Lei Zhang, 2017-06-27 08:07:24]

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

[commit-bot: I haz the power, 2017-06-27 08:07:36]

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, 2017-06-27 09:00:59]

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

[commit-bot: I haz the power, 2017-06-27 09:01:00]

Dry run: This issue passed the CQ dry run.

[Lei Zhang, 2017-06-27 17:40:25]

thestig@chromium.org changed reviewers:
+ skau@chromium.org

[skau, 2017-06-27 19:19:36]

lgtm

[Lei Zhang, 2017-06-27 19:38:07]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2017-06-27 19:38:21]

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, 2017-06-27 19:42:10]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1498592287943510, "parent_rev":
"342afc7737e47aea1d7b2bf461fd2c40be2e19eb", "commit_rev":
"7d380bea073931bcc05118e861ffe2d8fe0d9403"}

[commit-bot: I haz the power, 2017-06-27 19:42:22]

Description was changed from

==========
Remove GetBlockingPool() usage in PrinterCapabilitiesTest.

The function being tested only cares about enforcing ThreadRestrictions
now. Since the unit test does not enforce ThreadRestrictions, just call
the function being tested.

Also put the test in the printing namespace.

BUG=667892
==========

to

==========
Remove GetBlockingPool() usage in PrinterCapabilitiesTest.

The function being tested only cares about enforcing ThreadRestrictions
now. Since the unit test does not enforce ThreadRestrictions, just call
the function being tested.

Also put the test in the printing namespace.

BUG=667892

Review-Url: https://codereview.chromium.org/2959823003
Cr-Commit-Position: refs/heads/master@{#482714}
Committed:
https://chromium.googlesource.com/chromium/src/+/7d380bea073931bcc05118e861ff...
==========

[commit-bot: I haz the power, 2017-06-27 19:42:22]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/7d380bea073931bcc05118e861ff...