Update chrome/browser/memory OWNERS

Add vovoy@chromium.org as owner for oom_memory_details.* and
memory_kills_* files, remove cylee@chromium.org.

Change-Id: Ie0789315943a0adea4a9fa05107174ce39770448
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489381Reviewed-by: Cheng-Yu Lee <cylee@chromium.org>
Commit-Queue: Kuo-Hsin Yang <vovoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819683}

chrome/browser/memory/OWNERS

 chrisha@chromium.org
-cylee@chromium.org
+
+# OOM and memory kills logging
+per-file memory_kills_*=vovoy@chromium.org
+per-file oom_memory_details.*=vovoy@chromium.org
+
 # COMPONENT: Blink>MemoryAllocator
 # TEAM: catan-team@chromium.org