[wasm] Update owners of src/trap-handler

R=bradnelson@chromium.org, titzer@chromium.org
CC=ahaas@chromium.org

No-Try: true
Change-Id: I0843b33f04861b8c829fac27231a39452db9f7a6
Reviewed-on: https://chromium-review.googlesource.com/1136443Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54445}

src/trap-handler/OWNERS

 set noparent
 
-bradnelson@chromium.org
-eholk@chromium.org
+titzer@chromium.org
+ahaas@chromium.org
 
 # Changes to this directory should also be reviewed by:
 #
-#   eholk@chromium.org
+#   ahaas@chromium.org
 #   mseaborn@chromium.org
 #   mark@chromium.org