Make the position of 'n files selected' label synced with the width of navigation list.

Make the position of 'n files selected' label synced with the width of navigation list.

BUG=402344
TEST=select some items, drag the separator for navigation list, and check that the 'n files selected' label is synced with the separator's position.

[fukino, 2015-02-09 05:58:51]

fukino@chromium.org changed reviewers:
+ yawano@chromium.org

[fukino, 2015-02-09 05:58:52]

Could you take a look? Thanks!

[yawano, 2015-02-09 07:35:50]

lgtm. Thank you!

[fukino, 2015-02-09 07:36:24]

Thanks!

[fukino, 2015-02-09 07:36:37]

The CQ bit was checked by fukino@chromium.org

[commit-bot: I haz the power, 2015-02-09 07:37:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/904403002/20001

[commit-bot: I haz the power, 2015-02-09 08:00:34]

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

[commit-bot: I haz the power, 2015-02-09 08:00:35]

Try jobs failed on following builders:
  win_gpu on tryserver.chromium.gpu (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu/builds/12...)
  win_gpu_triggered_tests on tryserver.chromium.gpu (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[fukino, 2015-02-09 08:06:32]

The CQ bit was checked by fukino@chromium.org

[commit-bot: I haz the power, 2015-02-09 08:07:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/904403002/20001

[commit-bot: I haz the power, 2015-02-09 08:37:35]

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

[commit-bot: I haz the power, 2015-02-09 08:37:35]

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

[fukino, 2015-02-09 10:42:31]

The CQ bit was checked by fukino@chromium.org

[commit-bot: I haz the power, 2015-02-09 10:43:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/904403002/20001

[commit-bot: I haz the power, 2015-02-09 13:03:52]

Patchset 2 (id:??) landed as
https://crrev.com/3202364f5ec3ad0903791593d3021c34e9c4c8da
Cr-Commit-Position: refs/heads/master@{#315283}

[commit-bot: I haz the power, 2015-02-09 13:04:03]

Committed patchset #2 (id:20001)