accessibility: Simpler AXTree root accessor.

accessibility: Simpler AXTree root accessor.

- It does not need to be virtual.
- Since it is a simple getter accessor it can be inlined in the header
file and thus renamed to just root().

BUG=None
R=dmazzoni@chromium.org,avi@chromium.org
TBR=dtseng@chromium.org

Committed: https://crrev.com/6b1c1e08e82080c9b7a15bd5f3651b6e56df8cde
Cr-Commit-Position: refs/heads/master@{#317444}

[dmazzoni, 2015-02-20 00:42:27]

lgtm

[tfarina, 2015-02-20 00:53:27]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-02-20 00:54:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/940753002/60001

[commit-bot: I haz the power, 2015-02-20 01:00:55]

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

[commit-bot: I haz the power, 2015-02-20 01:00:56]

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...)

[tfarina, 2015-02-20 01:03:05]

tfarina@chromium.org changed reviewers:
+ avi@chromium.org

[tfarina, 2015-02-20 01:03:05]

Avi, could you approve the content/ changes?

[Avi (use Gerrit), 2015-02-20 20:25:49]

lgtm

[Avi (use Gerrit), 2015-02-20 20:25:54]

The CQ bit was checked by avi@chromium.org

[commit-bot: I haz the power, 2015-02-20 20:27:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/940753002/60001

[commit-bot: I haz the power, 2015-02-20 22:28:26]

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

[commit-bot: I haz the power, 2015-02-20 22:28:27]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
Timed out jobs are not retried to avoid causing additional load on the builders
with large pending queues.

[tfarina, 2015-02-20 22:33:30]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-02-20 22:34:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/940753002/60001

[commit-bot: I haz the power, 2015-02-20 23:04:54]

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

[commit-bot: I haz the power, 2015-02-20 23:04:56]

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...)

[tfarina, 2015-02-20 23:23:46]

tfarina@chromium.org changed reviewers:
+ dtseng@chromium.org

[tfarina, 2015-02-20 23:24:44]

TBRing David for trivial changes in chrome/browser/extensions/api/automation/

[tfarina, 2015-02-20 23:24:51]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-02-20 23:25:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/940753002/60001

[commit-bot: I haz the power, 2015-02-20 23:47:14]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-02-20 23:48:11]

Patchset 4 (id:??) landed as
https://crrev.com/6b1c1e08e82080c9b7a15bd5f3651b6e56df8cde
Cr-Commit-Position: refs/heads/master@{#317444}