SmartLock: Move easy_unlock implementation to CrOS directory.

Bug: 817115
Test: Existing tests
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_dbg_ng
Change-Id: Id47751ab67ffa8cbedd3156657febee6ca84dd0a
Reviewed-on: https://chromium-review.googlesource.com/947583
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#540930}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5330caefca2ea140467214d2ac68eb714c8a3bc0

check_gn_headers_whitelist.txt

@@ -41,6 +41,7 @@ chrome/browser/chromeos/certificate_provider/certificate_requests.h
 chrome/browser/chromeos/certificate_provider/pin_dialog_manager.h
 chrome/browser/chromeos/certificate_provider/sign_requests.h
 chrome/browser/chromeos/certificate_provider/thread_safe_certificate_map.h
+chrome/browser/chromeos/login/easy_unlock/easy_unlock_service_observer.h
 chrome/browser/chromeos/login/signin/oauth2_login_manager.h
 chrome/browser/chromeos/login/signin/oauth2_login_verifier.h
 chrome/browser/chromeos/login/signin/oauth2_token_fetcher.h
@@ -62,7 +63,6 @@ chrome/browser/notifications/displayed_notifications_dispatch_callback.h
 chrome/browser/permissions/permission_queue_controller.h
 chrome/browser/prefs/active_profile_pref_service.h
 chrome/browser/rlz/chrome_rlz_tracker_delegate.h
-chrome/browser/signin/easy_unlock_service_observer.h
 chrome/browser/ui/android/content_settings/subresource_filter_infobar_delegate.h
 chrome/browser/ui/app_icon_loader_delegate.h
 chrome/browser/ui/app_list/app_list_syncable_service_factory.h