The `find` utility does not support iname option. Use grep to work
around this limitation.

Change-Id: Iee16def0e4eea8b868c4f3aad164caa0bd7e9d5d
Reviewed-on: https://chromium-review.googlesource.com/1106651
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>