[fsp] Remove the exclusive field from the CreateDirectory operation.

[fsp] Remove the exclusive field from the CreateDirectory operation.

Analogically to CreateFile, we should just return an EXISTS error code if the
entry already exists. The EXISTS error code is later converted to OK if the
operation was requested to be not 'exclusive'.

TBR=benwells@chromium.org
TEST=browser_tests, unit_tests: *FileSystemProvider*CreateDirectory*
BUG=393141
Committed: https://crrev.com/8cba4967ecfc5edbc0534964c940af9887582dbc
Cr-Commit-Position: refs/heads/master@{#292873}

[mtomasz, 2014-09-01 05:54:59]

mtomasz@chromium.org changed reviewers:
+ kinaba@chromium.org

[mtomasz, 2014-09-01 05:55:52]

@kinaba: PTAL. Thanks.

[kinaba, 2014-09-01 08:01:35]

lgtm

[mtomasz, 2014-09-01 08:09:10]

The CQ bit was checked by mtomasz@chromium.org

[commit-bot: I haz the power, 2014-09-01 08:09:55]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mtomasz@chromium.org/528683002/1

[commit-bot: I haz the power, 2014-09-01 09:00:31]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[commit-bot: I haz the power, 2014-09-01 09:04:25]

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

[commit-bot: I haz the power, 2014-09-01 09:04:26]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[mtomasz, 2014-09-01 09:11:04]

mtomasz@chromium.org changed reviewers:
+ benwells@chromium.org

[mtomasz, 2014-09-01 09:11:05]

@benwells: TBR for the IDL change.

[mtomasz, 2014-09-01 09:11:23]

The CQ bit was checked by mtomasz@chromium.org

[commit-bot: I haz the power, 2014-09-01 09:12:00]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mtomasz@chromium.org/528683002/20001

[commit-bot: I haz the power, 2014-09-01 13:53:12]

Committed patchset #2 (id:20001) as 8016593aa165dcb5eeb752bb77d5ccb3cfdc9be1

[commit-bot: I haz the power, 2014-09-10 03:16:54]

Patchset 2 (id:??) landed as
https://crrev.com/8cba4967ecfc5edbc0534964c940af9887582dbc
Cr-Commit-Position: refs/heads/master@{#292873}