Cleanup: Use base/files/file_util.h instead of base/file_util.h in apps/ and extensions/

Cleanup: Use base/files/file_util.h instead of base/file_util.h in apps/ and extensions/

Committed: https://crrev.com/9471270bbe0113fce8ccd4a79b22782f21b061a1
Cr-Commit-Position: refs/heads/master@{#294136}

[Lei Zhang, 2014-09-09 21:56:52]

thestig@chromium.org changed reviewers:
+ yoz@chromium.org

[brettw, 2014-09-10 00:10:23]

brettw@chromium.org changed reviewers:
+ brettw@chromium.org

[brettw, 2014-09-10 00:10:23]

rs lgtm

[Yoyo Zhou, 2014-09-10 00:19:34]

LGTM

[Lei Zhang, 2014-09-10 06:49:10]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2014-09-10 06:58:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/thestig@chromium.org/558833002/1

[commit-bot: I haz the power, 2014-09-10 07:51:24]

Committed patchset #1 (id:1) as 01328426bee38bf9fd681663755000814d7ec164

[commit-bot: I haz the power, 2014-09-10 07:55:07]

Patchset 1 (id:??) landed as
https://crrev.com/9471270bbe0113fce8ccd4a79b22782f21b061a1
Cr-Commit-Position: refs/heads/master@{#294136}