GitLab

This CL adds a getEuicc utility method that automatically
selects the Euicc object to be used based on the useExternalEuicc
flag.

Fixed: 1166697
Change-Id: Ia6d962275365f6a347ee6687fe78a497eb5c79b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630739
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844351}