With gyp r1804 we can support having nice project folders without nested
subfolders. We must disable the parallel build for gyp as it is currently
broken in our project, and turned on by default.

Change-Id: Ie147ce423115009e254447d51cc30da0cfb2704f
Reviewed-on: https://chromium-review.googlesource.com/178782Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>