Remove brucedawson@ from some depot_tools OWNERS files

I'm leaving Google and I no longer wish to be an OWNER.

Change-Id: Id5b91b72596ce0ab06dcdc80998d76899797fcdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5907923
Reviewed-by: Gavin Mak <gavinmak@google.com>
Auto-Submit: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>

OWNERS

@@ -14,13 +14,11 @@ per-file LUCI_OWNERS=file://LUCI_OWNERS
 per-file RECLIENT_OWNERS=file://RECLIENT_OWNERS
 
 # Ninja
-per-file autoninja*=brucedawson@chromium.org
 per-file autoninja*=dpranke@google.com
 per-file autoninja*=file://BUILD_OWNERS
 per-file ninja*=dpranke@google.com
 per-file ninja*=thakis@chromium.org
 per-file ninja*=file://BUILD_OWNERS
-per-file post_build_ninja_summary.py=brucedawson@chromium.org
 per-file post_build_ninja_summary.py=file://BUILD_OWNERS
 
 # GN
@@ -42,8 +40,6 @@ per-file build_telemetry*=file://BUILD_OWNERS
 per-file bazel*=file://CROS_OWNERS
 per-file bazel*=file://BUILD_OWNERS
 
-per-file presubmit*.py=brucedawson@chromium.org
-
 per-file pylint*=vapier@chromium.org
 
 # ChromeOS related tooling

tests/OWNERS

@@ -1,4 +1,3 @@
-per-file autoninja_test.py=brucedawson@chromium.org
 per-file autoninja_test.py=file://BUILD_OWNERS
 per-file bazel_test.py=file://CROS_OWNERS
 per-file build_telemetry_test.py=file://BUILD_OWNERS