Remove wangxianzhu@chromium.org from base/trace_event/OWNERS

I'm no longer working on and familiar with it.

Change-Id: I782454acffa5650700a0de0ea95fcdd170770a8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1909440
Auto-Submit: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Primiano Tucci <primiano@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714243}

base/trace_event/OWNERS

@@ -2,7 +2,6 @@ eseckler@chromium.org
 oysteine@chromium.org
 primiano@chromium.org
 skyostil@chromium.org
-per-file trace_event_android.cc=wangxianzhu@chromium.org
 
 # For memory-infra related changes
 ssid@chromium.org