Nominate myself to services/network/OWNERS

Until today, 105 CLs were submitted, and 40 CLs were
reviewed by me for platform/loader and OOR-CORS projects.

Change-Id: Ia3051e06bc7d1e2604c3ee190a308e7d9ff5a5d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880496Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709397}

services/network/OWNERS

@@ -11,6 +11,7 @@ mmenke@chromium.org
 morlovich@chromium.org
 reillyg@chromium.org
 rmcelrath@chromium.org
+toyoshim@chromium.org
 tsepez@chromium.org
 yhirano@chromium.org