Fix annottation of FileEntry to Entry.

Fix annottation of FileEntry to Entry.

Previously new metadata related codes use FileEntry as an input type in the
annotation, but it should be Entry because they can take DirectoryEntry also.

BUG=410766
TEST=None

Committed: https://crrev.com/30128b707a94ef2bc1cc38e7569e8def6b13dcf4
Cr-Commit-Position: refs/heads/master@{#314993}

[hirono, 2015-02-06 05:55:16]

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

[hirono, 2015-02-06 05:55:16]

PTAL, thanks!

[yawano, 2015-02-06 05:59:34]

lgtm. Thank you!

[hirono, 2015-02-06 06:20:35]

New patchsets have been uploaded after l-g-t-m from yawano@chromium.org

[hirono, 2015-02-06 06:48:00]

The CQ bit was checked by hirono@chromium.org

[commit-bot: I haz the power, 2015-02-06 06:48:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/897573003/20001

[commit-bot: I haz the power, 2015-02-06 07:19:47]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-06 07:22:07]

Patchset 2 (id:??) landed as
https://crrev.com/30128b707a94ef2bc1cc38e7569e8def6b13dcf4
Cr-Commit-Position: refs/heads/master@{#314993}