sqlite: Add huangdarwin@ to OWNERS

Change-Id: I98519ab0dd8c16733c05215db038575a1df85aed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779364
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692416}

third_party/sqlite/OWNERS

 # Primary:
-pwnall@chromium.org
+huangdarwin@chromium.org
 
 # Secondary:
 cmumford@google.com
+pwnall@chromium.org
 
 # TEAM: storage-dev@chromium.org
 # COMPONENT: Internals>Storage