Revert of Introduce ash mojo interface for lock screen action handlers

chrome/browser/chromeos/chrome_browser_main_chromeos.h

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.h
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.h b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
index c74a338d2a8f2121c292676cad21399dd157c371..3af4f64722203eaf1209e843ce45d80518a1af54 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.h
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
@@ -13,10 +13,6 @@
 #include "chrome/browser/chromeos/external_metrics.h"
 #include "chrome/browser/memory/memory_kills_monitor.h"
 #include "chromeos/system/version_loader.h"
-
-namespace lock_screen_apps {
-class StateController;
-}
 
 namespace session_manager {
 class SessionManager;
@@ -102,9 +98,6 @@
 
   std::unique_ptr<memory::MemoryKillsMonitor::Handle> memory_kills_monitor_;
 
-  std::unique_ptr<lock_screen_apps::StateController>
-      lock_screen_apps_state_controller_;
-
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };