Preparation to convert GetPrimaryAccount to return CoreAccountInfo

Change client code to work as if IdentityManager::GetPrimaryAccount
where returning a CoreAccountInfo instead of an AccountInfo. Method
will be updated in a followup CL.

This CL was uploaded by git cl split.

Bug: 926204
Change-Id: Ib01a380d83bbfdc364b5d7ae9edc845769112684
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1499461
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642985}
2 files changed