[s13n] Add Android-specific IdentityManager::ForceRefreshOfExtendedAccountInfo

This CL forces to refresh the account info for Android and
OnExtendedAccountInfoUpdated is fired if the info is successfully
fetched. Also it replaces usage of FetchUserInfoBeforeSignin.

Bug: 931716
Change-Id: I8a8eb9b55f7afd20e89cbcc6c0506fbcdfe9572a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1481170
Commit-Queue: Miyoung Shin <myid.shin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638050}
8 files changed