[Extensions Toolbar] Refactor a few test classes

[Extensions Toolbar] Refactor a few test classes

Pull the implementation of TestToolbarActionsBarHelper into
BrowserActionTestUtil. The former is really only ever used
with the latter, and this allows:
- Tests to only worry about one test object.
- For one top-level fewer platform-specific test class.

TBR=sky@chromium.org (something wonky in our OWNERs check isn't counting Finnur/me as owners for toolbar actions stuff...)

Committed: https://crrev.com/0c1c08b20cec291b23f1ee04018886ba70d67008
Cr-Commit-Position: refs/heads/master@{#327134}

[Devlin, 2015-04-24 23:47:35]

Patchset #1 (id:1) has been deleted

[Devlin, 2015-04-24 23:47:40]

Patchset #1 (id:20001) has been deleted

[Devlin, 2015-04-24 23:47:44]

Patchset #1 (id:40001) has been deleted

[Devlin, 2015-04-24 23:47:49]

Patchset #1 (id:60001) has been deleted

[Devlin, 2015-04-24 23:50:47]

rdevlin.cronin@chromium.org changed reviewers:
+ finnur@chromium.org

[Devlin, 2015-04-24 23:50:47]

Mind taking a look?  Just shifting code in this one (needed it for the next
one). :)

[Finnur, 2015-04-27 13:42:08]

LGTM

[Devlin, 2015-04-27 18:29:42]

Patchset #2 (id:100001) has been deleted

[Devlin, 2015-04-27 18:30:21]

rdevlin.cronin@chromium.org changed reviewers:
+ avi@chromium.org

[Devlin, 2015-04-27 18:30:22]

Avi, mind taking a quick look at the Cocoa?  Just code movement, but a little
more than a TBR.

[Avi (use Gerrit), 2015-04-27 18:35:46]

lgtm

stampity stamp

[Devlin, 2015-04-27 20:13:19]

Patchset #3 (id:140001) has been deleted

[Devlin, 2015-04-27 20:13:23]

The CQ bit was checked by rdevlin.cronin@chromium.org

[Devlin, 2015-04-27 20:13:23]

The patchset sent to the CQ was uploaded after l-g-t-m from finnur@chromium.org,
avi@chromium.org
Link to the patchset: https://codereview.chromium.org/1104813005/#ps160001
(title: " ")

[commit-bot: I haz the power, 2015-04-27 20:13:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1104813005/160001

[commit-bot: I haz the power, 2015-04-27 20:22:40]

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

[commit-bot: I haz the power, 2015-04-27 20:22:42]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Devlin, 2015-04-27 21:05:55]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2015-04-27 21:07:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1104813005/160001

[commit-bot: I haz the power, 2015-04-27 21:35:37]

Committed patchset #3 (id:160001)

[commit-bot: I haz the power, 2015-04-27 21:37:05]

Patchset 3 (id:??) landed as
https://crrev.com/0c1c08b20cec291b23f1ee04018886ba70d67008
Cr-Commit-Position: refs/heads/master@{#327134}