This removes the use of the ErrorOrResult class from these methods.
This will enable more performant Error handling. Also cleans up the
ANGLE_TRY_CHECKED_MATH macro to be more general.

Bug: angleproject:2713
Change-Id: I349947d320907839ca88ec1f9251e6ddc3858a08
Reviewed-on: https://chromium-review.googlesource.com/1128920
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Frank Henigman <fjhenigman@chromium.org>