Remove the extra guard in InstanceIDProfileService

Remove the extra guard in InstanceIDProfileService

This is not longer needed since we only guard the API under
_api_features. This extra guard is causing the test failures in officla
builds since extensions::ScopedCurrentChannel does not affect the
regular chrome channel settings.

BUG=489368
TEST=existing tests

Committed: https://crrev.com/b5dd6d281e4f1209063594e0c96b3279591bfc4e
Cr-Commit-Position: refs/heads/master@{#330572}

[fgorski, 2015-05-19 14:05:19]

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

[fgorski, 2015-05-19 14:05:20]

lgtm

[jianli, 2015-05-19 18:35:14]

The CQ bit was checked by jianli@chromium.org

[commit-bot: I haz the power, 2015-05-19 18:36:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131793011/1

[commit-bot: I haz the power, 2015-05-19 18:40:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-19 18:41:30]

Patchset 1 (id:??) landed as
https://crrev.com/b5dd6d281e4f1209063594e0c96b3279591bfc4e
Cr-Commit-Position: refs/heads/master@{#330572}

[Nico, 2015-05-20 00:17:59]

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

[Nico, 2015-05-20 00:17:59]

Looks like this also fixed browser_tests in buildtype=Official. Thanks! :-)