[Files.app] Add a shortcut key (Ctrl-Shift-E) to eject a removable device

[Files.app] Add a shortcut key (Ctrl-Shift-E) to eject a removable device

BUG=459693
TEST=manually tested

Committed: https://crrev.com/5c7a0dc6f337f8a2c086df5ef0d9b6d4984bffe5
Cr-Commit-Position: refs/heads/master@{#318179}

[yoshiki, 2015-02-25 14:59:07]

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

[yoshiki, 2015-02-25 14:59:19]

@fukino-san, PTAL. Thanks.

[fukino, 2015-02-25 15:44:04]

lgtm.

[yoshiki, 2015-02-26 00:31:59]

The CQ bit was checked by yoshiki@chromium.org

[yoshiki, 2015-02-26 00:32:00]

The patchset sent to the CQ was uploaded after l-g-t-m from fukino@chromium.org
Link to the patchset: https://codereview.chromium.org/954113004/#ps20001 (title:
"Added a comment.")

[commit-bot: I haz the power, 2015-02-26 00:32:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/954113004/20001

[commit-bot: I haz the power, 2015-02-26 00:35:21]

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

[commit-bot: I haz the power, 2015-02-26 00:35:22]

Try jobs failed on following builders:
  ios_rel_device_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ng...)
  ios_rel_device_ninja_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)

[yoshiki, 2015-02-26 02:04:44]

The CQ bit was checked by yoshiki@chromium.org

[commit-bot: I haz the power, 2015-02-26 02:06:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/954113004/20001

[commit-bot: I haz the power, 2015-02-26 03:15:00]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-26 03:17:24]

Patchset 2 (id:??) landed as
https://crrev.com/5c7a0dc6f337f8a2c086df5ef0d9b6d4984bffe5
Cr-Commit-Position: refs/heads/master@{#318179}