"entry" is an old C keyword, so it's better not to use it as a variable name.
Also fix a few other minor style issues in the code.

TEST=angle_unittests
BUG=angleproject:941

Change-Id: I59470555227985262b3e914ff6ca11e88d15fd8c
Reviewed-on: https://chromium-review.googlesource.com/265647Tested-by: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>