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This patch changes SessionManagerObserver::OnPrimaryUserSessionStarted
to notify for non-primary user sessions as well. This makes it align
with NOTIFICATION_SESSION_STARTED.

Two notification observers are updated:
- LocaleChangeGuard
- first_run.cc (some dead code is also deleted)

On[Primary]UserSessionStarted(), and NOTIFICATION_SESSION_STARTED,
are different from UserSessionStateObserver::OnActiveUserChanged
in that they are called when the UI is fully ready. This is appropriate
for the two observers that are updated in this CL, both of which want
to show UI right after login.

Bug: 268984

Change-Id: Iac5ba9541e99a74a29758db6e3c678e1dcbfa630
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1767494Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690074}