Remove try-catch blocks from entry points.

BUG=angle:700

Change-Id: I036901c397053a75677923304d7e1ed697c82aa2
Reviewed-on: https://chromium-review.googlesource.com/209570
Reviewed-by: <ehsan@mozilla.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
31 files changed