Adding missing profile.h include to extensions code.

Adding missing profile.h include to extensions code.

external_pref_loader.cc uses profile.h so it needs to include it and
not rely on some other random code to include it. Fixes compilation
problems in certain configurations.

Committed: https://crrev.com/9c086426f0e4f8f77706ea02abb927419c51d907
Cr-Commit-Position: refs/heads/master@{#328511}

[Daniel Bratell, 2015-05-04 14:44:14]

bratell@opera.com changed reviewers:
+ asargent@chromium.org, ginkage@chromium.org

[Daniel Bratell, 2015-05-04 14:44:14]

Just a missing include, please take a look.

[asargent_no_longer_on_chrome, 2015-05-05 20:43:35]

lgtm

[Daniel Bratell, 2015-05-06 07:43:20]

The CQ bit was checked by bratell@opera.com

[commit-bot: I haz the power, 2015-05-06 07:43:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1126543003/1

[commit-bot: I haz the power, 2015-05-06 09:30:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-06 09:31:41]

Patchset 1 (id:??) landed as
https://crrev.com/9c086426f0e4f8f77706ea02abb927419c51d907
Cr-Commit-Position: refs/heads/master@{#328511}