Remove race in DeclarativeContentApiTest.RulesPersistence test

Remove race in DeclarativeContentApiTest.RulesPersistence test

BUG=

Committed: https://crrev.com/28218513bf9580515b03c73ab786c27844e9b40b
Cr-Commit-Position: refs/heads/master@{#339432}

[matthewtff.asm, 2015-07-07 11:23:16]

matthewtff@yandex-team.ru changed reviewers:
+ battre@chromium.org

[matthewtff.asm, 2015-07-07 11:26:12]

On 2015/07/07 11:23:16, matthewtff.asm wrote:
> mailto:matthewtff@yandex-team.ru changed reviewers:
> + mailto:battre@chromium.org

On my mac extensions loads before the test body starts execution and
ExtensionTestMessageListener starts listening for "second run ready" event.

I went to http://build.chromium.org/f/chromium/flakiness/ and looks like
this test also times out quite regularly on trybots.

Please, take a look at fix.

[battre, 2015-07-07 14:17:51]

+wittman FYI

LGTM

[matthewtff.asm, 2015-07-07 14:25:05]

The CQ bit was checked by matthewtff@yandex-team.ru

[commit-bot: I haz the power, 2015-07-07 14:25:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1222193006/1

[commit-bot: I haz the power, 2015-07-07 14:25:42]

The author matthewtff@yandex-team.ru has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[commit-bot: I haz the power, 2015-07-07 14:27:06]

The author matthewtff@yandex-team.ru has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[commit-bot: I haz the power, 2015-07-07 14:31:13]

The author matthewtff@yandex-team.ru has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[matthewtff.asm, 2015-07-07 14:32:12]

The CQ bit was unchecked by matthewtff@yandex-team.ru

[matthewtff.asm, 2015-07-20 10:19:12]

The CQ bit was checked by matthewtff@yandex-team.ru

[commit-bot: I haz the power, 2015-07-20 10:19:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1222193006/1

[commit-bot: I haz the power, 2015-07-20 10:19:22]

The author matthewtff@yandex-team.ru has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[matthewtff.asm, 2015-07-20 10:20:08]

On 2015/07/07 14:31:13, commit-bot: I haz the power wrote:
> The author mailto:matthewtff@yandex-team.ru has not signed Google Contributor
License
> Agreement. Please visit https://cla.developers.google.com to sign and manage
> CLA.

Looks like this message is expected. See https://crbug.com/510156

[commit-bot: I haz the power, 2015-07-20 10:31:48]

The author matthewtff@yandex-team.ru has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[commit-bot: I haz the power, 2015-07-20 11:01:51]

The author matthewtff@yandex-team.ru has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[commit-bot: I haz the power, 2015-07-20 11:27:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-20 11:28:35]

Patchset 1 (id:??) landed as
https://crrev.com/28218513bf9580515b03c73ab786c27844e9b40b
Cr-Commit-Position: refs/heads/master@{#339432}

[Mike Wittman, 2015-07-21 19:20:41]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1247743004/ by wittman@chromium.org.

The reason for reverting is: Breaks linux clang tot bot
(https://crbug.com/512506) and causes flakiness on Vista Tests bot
(https://crbug.com/512431).

BUG=512506, 512431.