GLES2: Reformat entry point header.
GLES2: Reformat entry point header.

This should simplify the diff with the auto-gen patch.

BUG=angleproject:1309

Change-Id: Ibea503f236e7dc07d0862e20f77e866d6ec1f316
Reviewed-on: https://chromium-review.googlesource.com/489081
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

ecoal95/angle,ecoal95/angle,MSOpenTech/angle,MSOpenTech/angle,MSOpenTech/angle,ecoal95/angle,ppy/angle,ecoal95/angle,ppy/angle,ppy/angle,MSOpenTech/angle,ppy/angle,ecoal95/angle