Fix dependencies on //components/policy in gn files

Fix dependencies on //components/policy in gn files

BUG=

Committed: https://crrev.com/fe85385d68ca39e48ee37dd7fe952c17b2440b6f
Cr-Commit-Position: refs/heads/master@{#318246}

[Tomasz Moniuszko, 2015-02-25 10:46:06]

tmoniuszko@opera.com changed reviewers:
+ brettw@chromium.org, sdefresne@chromium.org

[brettw, 2015-02-25 16:41:21]

lgtm

[sdefresne, 2015-02-25 16:41:48]

lgtm

[Tomasz Moniuszko, 2015-02-26 08:27:11]

The CQ bit was checked by tmoniuszko@opera.com

[commit-bot: I haz the power, 2015-02-26 08:27:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/952163002/1

[commit-bot: I haz the power, 2015-02-26 08:41:41]

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

[commit-bot: I haz the power, 2015-02-26 08:41:42]

Try jobs failed on following builders:
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Tomasz Moniuszko, 2015-02-26 15:34:25]

I can't explain how I forgot to add this import in previous patch set.

[sdefresne, 2015-02-26 15:40:02]

lgtm

[Tomasz Moniuszko, 2015-02-26 15:49:23]

The CQ bit was checked by tmoniuszko@opera.com

[Tomasz Moniuszko, 2015-02-26 15:49:23]

The patchset sent to the CQ was uploaded after l-g-t-m from brettw@chromium.org
Link to the patchset: https://codereview.chromium.org/952163002/#ps20001 (title:
"Missing import")

[commit-bot: I haz the power, 2015-02-26 15:49:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/952163002/20001

[commit-bot: I haz the power, 2015-02-26 16:22:10]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-26 16:23:36]

Patchset 2 (id:??) landed as
https://crrev.com/fe85385d68ca39e48ee37dd7fe952c17b2440b6f
Cr-Commit-Position: refs/heads/master@{#318246}