[Enhanced Bookmark] Change "Bookmark Bar" to "Bookmark bar" on Android

[Enhanced Bookmark] Change "Bookmark Bar" to "Bookmark bar" on Android

Upper case letters for all words is not Android style.

BUG=NONE

Committed: https://crrev.com/4f788f0229be905dc611b90640e2447134a20139
Cr-Commit-Position: refs/heads/master@{#322603}

[Ian Wen, 2015-03-26 20:56:27]

ianwen@chromium.org changed reviewers:
+ sky@chromium.org

[sky, 2015-03-27 15:31:24]

LGTM

[Ian Wen, 2015-03-27 16:52:14]

The CQ bit was checked by ianwen@chromium.org

[commit-bot: I haz the power, 2015-03-27 16:52:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1029423011/1

[commit-bot: I haz the power, 2015-03-27 17:58:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-27 17:59:31]

Patchset 1 (id:??) landed as
https://crrev.com/4f788f0229be905dc611b90640e2447134a20139
Cr-Commit-Position: refs/heads/master@{#322603}