Move member initializers from Caps.cpp into the struct definitions. BUG=angleproject:3663 Change-Id: I13a1a920173e3f2e5360e6d7253f24a44bdc5e13 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1690675 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>