Updated base/trace_event/OWNERS

Added chiniforooshan@ who has contributed to tracing for a long time and is as familiar with the codebase as anyone.

Moved some inactive owners to emeritus.

R=primiano@chromium.org
CC=chiniforooshan@chromium.org

Change-Id: I2d2ae64677b7d33228101ceaa10f5b23eceba0a9
Reviewed-on: https://chromium-review.googlesource.com/1033324Reviewed-by: Primiano Tucci <primiano@chromium.org>
Commit-Queue: Primiano Tucci <primiano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554799}

base/trace_event/OWNERS

-dsinclair@chromium.org
-nduca@chromium.org
+chiniforooshan@chromium.org
 oysteine@chromium.org
 primiano@chromium.org
-simonhatch@chromium.org
 per-file trace_event_android.cc=wangxianzhu@chromium.org
 
 # For memory-infra related changes
 ssid@chromium.org
 
+# Emeritus:
+dsinclair@chromium.org
+nduca@chromium.org
+simonhatch@chromium.org
+
 # TEAM: tracing@chromium.org
 # COMPONENT: Speed>Tracing