They can be re-enabled with the angle_enable_trace option.
Prevents validation errors from being output in NoFixture tests,
as the default platform methods aren't overridden.

Bug: angleproject:3525
Change-Id: I77342230b6c7cd167cfc3169f09d4e74b4579244
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1669848Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>