Files.app: Fix DirectoryModel#partialUpdate so that it does not ignore changes.

Files.app: Fix DirectoryModel#partialUpdate so that it does not ignore changes.

Previously DirectoryModel#partialUpdate ignores changes if the function is
called multiple times during the previous request is being procecced.

BUG=417163
TEST=Repo steps of the bug.

Committed: https://crrev.com/8ad2b71e4fc3f7a0ee4e4b378733c1f8c4bdf8fd
Cr-Commit-Position: refs/heads/master@{#297381}

[hirono, 2014-09-30 02:31:46]

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

[hirono, 2014-09-30 02:32:05]

PTAL the CL? Thank you!

[yoshiki, 2014-09-30 06:55:17]

lgtm

[hirono, 2014-09-30 07:51:20]

The CQ bit was checked by hirono@chromium.org

[hirono, 2014-09-30 07:51:28]

On 2014/09/30 06:55:17, yoshiki wrote:
> lgtm

Thanks!

[commit-bot: I haz the power, 2014-09-30 07:52:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/611193002/20001

[commit-bot: I haz the power, 2014-09-30 08:30:18]

Committed patchset #2 (id:20001) as c96c95876dea4325acb8121f05c1b75aea9d3c01

[commit-bot: I haz the power, 2014-09-30 08:31:18]

Patchset 2 (id:??) landed as
https://crrev.com/8ad2b71e4fc3f7a0ee4e4b378733c1f8c4bdf8fd
Cr-Commit-Position: refs/heads/master@{#297381}