chrome/browser/web_applications/OWNERS: Add new owners.

Adds cmp and dmurph as general owners; oyiptong as file handler owner.

Change-Id: I0d2e92704610f4d5f915f31768a77b22fb9ba4dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153530
Auto-Submit: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760384}

chrome/browser/web_applications/OWNERS

 alancutter@chromium.org
 benwells@chromium.org
 calamity@chromium.org
+cmp@chromium.org
+dmurph@chromium.org
 dominickn@chromium.org
 ericwilligers@chromium.org
 loyso@chromium.org
@@ -14,3 +16,4 @@ tapted@chromium.org
 
 per-file web_app_file_handler*=davidbienvenu@chromium.org
 per-file web_app_file_handler*=jessemckenna@google.com
+per-file web_app_file_handler*=oyiptong@chromium.org