Add karandeepb@ to url_pattern_index/OWNERS

Bug: None
Change-Id: Ifa3a39ba86ba899f9c736c779f20d8924dc302ce
Reviewed-on: https://chromium-review.googlesource.com/1207610Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588931}

components/url_pattern_index/OWNERS

 csharrison@chromium.org
 engedy@chromium.org
+karandeepb@chromium.org
 pkalinnikov@chromium.org