Add hidehiko to OWNERS as Mojo maintainer.

Similar to libmojo/OWNERS, add myself to libchrome because
libmojo is being merged into libchrome.

Bug: None
Test: None
Change-Id: I5c6f411e812530571e1bcbd91bf14b6db0ba60b8
diff --git a/OWNERS b/OWNERS
index 65f5a6b..8d673fa 100644
--- a/OWNERS
+++ b/OWNERS
@@ -5,3 +5,4 @@
 
 # For Mojo changes.
 lhchavez@google.com
+hidehiko@google.com