Revert of [M53 cherry-pick] Migrate ArcUserDataService into ArcAuthService.

chrome/browser/chromeos/arc/arc_auth_service_unittest.cc

Index: chrome/browser/chromeos/arc/arc_auth_service_unittest.cc
diff --git a/chrome/browser/chromeos/arc/arc_auth_service_unittest.cc b/chrome/browser/chromeos/arc/arc_auth_service_unittest.cc
index 5618920c5924674b8ee5c2f5d83b0bc66554416f..ba30f6a48ddbe35fcfe5b6dc5ea472594e038e77 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service_unittest.cc
+++ b/chrome/browser/chromeos/arc/arc_auth_service_unittest.cc
@@ -25,7 +25,6 @@
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
 #include "chromeos/chromeos_switches.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/login/user_names.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/test/fake_arc_bridge_service.h"
@@ -59,8 +58,6 @@
   ~ArcAuthServiceTest() override = default;
 
   void SetUp() override {
-    chromeos::DBusThreadManager::Initialize();
-
     base::CommandLine::ForCurrentProcess()->AppendSwitch(
         chromeos::switches::kEnableArc);
     ArcAuthService::DisableUIForTesting();
@@ -89,10 +86,7 @@
     chromeos::WallpaperManager::Initialize();
   }
 
-  void TearDown() override {
-    chromeos::WallpaperManager::Shutdown();
-    chromeos::DBusThreadManager::Shutdown();
-  }
+  void TearDown() override { chromeos::WallpaperManager::Shutdown(); }
 
   chromeos::FakeChromeUserManager* GetFakeUserManager() const {
     return static_cast<chromeos::FakeChromeUserManager*>(