Add yusufo to OWNERS for chrome/browser/tab and persisted_state_db

Change-Id: Ic6460a234659c04473e486b7cf315ad67b386106
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530623
Commit-Queue: Yusuf Ozuysal <yusufo@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826591}

chrome/browser/persisted_state_db/OWNERS

+yusufo@chromium.org
+
+# TEAM: memex-team@google.com

chrome/browser/tab/OWNERS

+dtrainor@chromium.org
+jinsukkim@chromium.org
+nyquist@chromium.org
+yusufo@chromium.org
+
+# OS: Android