Instead of including "angle_trace_gl.h" in shared capture header
we can include it in each cpp file. This prevents a header conflict
with the "old" way of using the util GL loader.
Bug: angleproject:4845
Change-Id: Ia00a2beffc77446c779ceec8995fce9704e7b8af
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2315625Reviewed-by: Manh Nguyen <nguyenmh@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
