Fix type in Andoird string.

Bug: skia:
Change-Id: I975a7cb8e67735c3c27eec100204fb470cd89e56
Reviewed-on: https://skia-review.googlesource.com/c/188309
Auto-Submit: Greg Daniel <egdaniel@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>