[jumbo] avoid ambiguities between extensions::features:: and features::

extensions/common/extension_features.h contains an extensions::features
namespace, which can be confused with chrome/common/chrome_features.h's
features namespace in jumbo builds.

Let's disambiguate these enough to get jumbo builds working again.

Followup to this CL, which uncovered the issue (but didn't cause it):
https://chromium-review.googlesource.com/c/chromium/src/+/1145630

Bug: 866170
Change-Id: Iea5cca04c3c636014eae14f987c4aecd2dfb93bc
Reviewed-on: https://chromium-review.googlesource.com/1147521
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#577342}
1 file changed