Add chrome/android/java/strings OWNERS

All committers should have the ability to modify strings.

BUG=876369

Change-Id: Ie2d456de05bb6da79b802a408c19ad3d657db187
Reviewed-on: https://chromium-review.googlesource.com/1187007Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585514}

chrome/android/java/strings/OWNERS

+# Please ensure you check for duplicate strings before adding new ones.
+#
+# Prefer generalizing feature specific existing strings instead of creating
+# a new version of the same (or an extremely similiar string).
+
+*