Clean up.

The web_request_permission.cc has been moved to //extensions, but for some reason its copy is still in //chrome. This CL does a clean up for it.

BUG=352293
Committed: https://crrev.com/5fbd3dbd1fba46949bc3802946bff5d0348116b6
Cr-Commit-Position: refs/heads/master@{#297939}

[Xi Han, 2014-10-02 20:22:57]

hanxi@chromium.org changed reviewers:
+ rockot@chromium.org

[Xi Han, 2014-10-02 20:22:58]

Ken: a very trivial change. Please take a look. Thanks:)

[Ken Rockot(use gerrit already), 2014-10-02 22:39:20]

lgtm

[Xi Han, 2014-10-02 22:45:13]

The CQ bit was checked by hanxi@chromium.org

[commit-bot: I haz the power, 2014-10-02 22:47:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/610323006/1

[commit-bot: I haz the power, 2014-10-02 23:02:59]

Committed patchset #1 (id:1) as 27f1c74f244d6efc40a7707a0ae7f7bfd1f79166

[commit-bot: I haz the power, 2014-10-02 23:04:23]

Patchset 1 (id:??) landed as
https://crrev.com/5fbd3dbd1fba46949bc3802946bff5d0348116b6
Cr-Commit-Position: refs/heads/master@{#297939}