Clear state if clear autofill data when shutdown.

because we won't receive personal-data-changed on shutdown

fix brave#4818

Auditors: @bridiver

Test Plan:
1. Add autofill data entries in about:autofill
2. Turn on clear "Autofill data" when closing brave in about:preferences#security
3. Restart brave
4. There shouldn't be anything left in about:autofill

app/sessionStore.js

@@ -252,6 +252,11 @@ module.exports.cleanAppData = (data, isShutdown) => {
   const clearAutofillData = isShutdown && getSetting(settings.SHUTDOWN_CLEAR_AUTOFILL_DATA) === true
   if (clearAutofillData) {
     autofill.clearAutofillData()
+    const date = new Date().getTime()
+    data.autofill.addresses.guid = []
+    data.autofill.addresses.timestamp = date
+    data.autofill.creditCards.guid = []
+    data.autofill.creditCards.timestamp = date
   }
   const clearSiteSettings = isShutdown && getSetting(settings.SHUTDOWN_CLEAR_SITE_SETTINGS) === true
   if (clearSiteSettings) {