Add shend to chrome/browser/input_method/OWNERS

Change-Id: I69cee3613a253fc0303b11c53f6e04650d1db6d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2143054Reviewed-by: Keith Lee <keithlee@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Keith Lee <keithlee@chromium.org>
Auto-Submit: Keith Lee <keithlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757717}

chrome/browser/chromeos/input_method/OWNERS

 # primary reviewers
+keithlee@chromium.org
+shend@chromium.org
 shuchen@chromium.org
 yhanada@chromium.org
-keithlee@chromium.org
 
 # backup reviewers
 yukishiino@chromium.org