Make myself a toplevel OWNER of testing/scripts.

Based on Dirk's comment on
https://chromium-review.googlesource.com/c/chromium/src/+/1611503 .

Change-Id: I9caa7421292dde93fce943eff6d8cd8a18b2dc9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1613563
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660242}

testing/scripts/OWNERS

@@ -4,12 +4,7 @@
 dpranke@chromium.org
 kbr@chromium.org
 martiniss@chromium.org
+crouleau@chromium.org
 
 # TEAM: infra-dev@chromium.org
 # COMPONENT: Infra>Client>Chrome
-
-# Adapters for Telemetry based tests.
-per-file run_gpu*=crouleau@chromium.org
-per-file run_telemetry*=crouleau@chromium.org
-per-file run_performance_tests*=crouleau@chromium.org
-per-file run_gtest*=crouleau@chromium.org