Since the above source file matches Compiler.cpp, more closely
follow our standard naming convention.

BUG=angle:466

Change-Id: Ib1422f87f16097f91f2bcdad550ec5bd940ce711
Reviewed-on: https://chromium-review.googlesource.com/204681Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>