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The goal of this series of patches is to propagate the keychain reload
flag that comes with the identity list update notification from
GCRSSOService.

This flag will be used by AuthenticationService to have a better signal
when the identity list is updated by another Google app (when the flag
is YES), or if the update comes from Chrome user actions.

* crrev.com/i/3513584: Receive the flag from GCRSSOService notification
=>crrev.com/c/2615421: Add support for the keychain reload flag
* crrev.com/i/3470951: Switching FireIdentityListChanged(bool) method
* crrev.com/c/2615538: FireIdentityListChanged() cleanup

Bug: 1097080
Change-Id: I5763ed1127ba1fe1e8e79953bea321803c06953d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615421
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842624}