Introduce SessionManager that will contain code to start user session on Chrome OS

Move profile creation / session initialization (prefs/RLZ) as well as some of OAuth session init
related code from LoginUtils to SessionManager. LoginUtils will temporarily implement
SessionManager::Delegate interface till existing test coverage is migrated from LoginUtils interface.
SessionManager will later use concept of UserSession (see design proposal at http://goto/cros-login-c14n).

LoginUtils::OnPrepareProfile() is split into
StartSession()
--PreStartSession() - things like switching logging dest
--CreateUserSession() - will eventually create UserSession instance
--StartCrosSession() - notify cros::SessionManager
--NotifyUserLoggedIn() - UserManager::UserLoggedIn()
--PrepareProfile()

PrepareProfile() - calls PM::CreateProfileAsync()
--OnProfileCreated()
----InitProfilePreferences() - early initialization
----UserProfileInitialized()
------transfer signin profile auth date (cookies/proxy auth/certs)
------RestoreAuthSessionImpl() - OAuth2LoginManager::RestoreSession()
----FinalizePrepareProfile(()
------Own TPM (if it didn't happen for some reason)
------Notify SAML offline signin limiter
------Notify ProfileImpl
------chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED
------InitRLZ (for primary user)
  

Minor cleanup
* Unify DemoApp profile initialization flow with regular one
* Don't pass display_email to LoginUtils::PrepareProfile
* Move powerwash related prefs registration to ResetScreenHandler
* Cleanup M31 migration code for |prefs::kProfileIsManaged| in LoginUtilsImpl::InitProfilePreferences()

BUG=370175,276163

Review URL: https://codereview.chromium.org/318853004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276626 0039d316-1c4b-4281-b951-d872f2087c98

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