objectSize() will return the size of all data in the structure, and
simply iterating over the data will work for determining whether two
structures are equal. The earlier complex and broken approach where the
structure was traversed recursively is not needed.

BUG=angleproject:1211
TEST=angle_unittests

Change-Id: I0e5c5ccbb767d44ef6acb0f1f25f27dfc42866e1
Reviewed-on: https://chromium-review.googlesource.com/312490
Tryjob-Request: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>