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

chrome/browser/ui/app_list/arc/arc_app_test.cc

Index: chrome/browser/ui/app_list/arc/arc_app_test.cc
diff --git a/chrome/browser/ui/app_list/arc/arc_app_test.cc b/chrome/browser/ui/app_list/arc/arc_app_test.cc
index e75719223f6ac424e293a2acc0b33356233f3e4d..4c97ec05ff2999bf7e5039e9eb4e3b91d6ef2ccc 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_test.cc
+++ b/chrome/browser/ui/app_list/arc/arc_app_test.cc
@@ -12,7 +12,6 @@
 #include "chrome/browser/ui/app_list/arc/arc_app_list_prefs.h"
 #include "chrome/browser/ui/app_list/arc/arc_app_list_prefs_factory.h"
 #include "chromeos/chromeos_switches.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/test/fake_app_instance.h"
 #include "components/arc/test/fake_arc_bridge_service.h"
@@ -48,10 +47,6 @@
 }
 
 void ArcAppTest::SetUp(Profile* profile) {
-  if (!chromeos::DBusThreadManager::IsInitialized()) {
-    chromeos::DBusThreadManager::Initialize();
-    dbus_thread_manager_initialized_ = true;
-  }
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       chromeos::switches::kEnableArc);
   DCHECK(!profile_);
@@ -128,13 +123,6 @@
 
 void ArcAppTest::TearDown() {
   auth_service_.reset();
-  if (dbus_thread_manager_initialized_) {
-    // DBusThreadManager may be initialized from other testing utility,
-    // such as ash::test::AshTestHelper::SetUp(), so Shutdown() only when
-    // it is initialized in ArcAppTest::SetUp().
-    chromeos::DBusThreadManager::Shutdown();
-    dbus_thread_manager_initialized_ = false;
-  }
 }
 
 void ArcAppTest::StopArcInstance() {