Remove unused includes in pref_hash_browsertest.cc

chrome/browser/prefs/tracked/pref_hash_browsertest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 #include <string>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 11 matching lines @@
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/prefs/chrome_pref_service_factory.h"
 #include "chrome/browser/prefs/profile_pref_store_manager.h"
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
-#include "components/prefs/pref_service.h"
-#include "components/prefs/scoped_user_pref_update.h"
 #include "components/search_engines/default_search_manager.h"
 #include "components/user_prefs/tracked/tracked_preference_histogram_names.h"
 #include "extensions/browser/pref_names.h"
 #include "extensions/common/extension.h"
 
 #if defined(OS_CHROMEOS)
 #include "chromeos/chromeos_switches.h"
 #endif
 
 namespace {
@@ skipping 909 matching lines @@
                      ALLOW_NONE));
     EXPECT_EQ(
         0, GetTrackedPrefHistogramCount(
                user_prefs::tracked::kTrackedPrefHistogramMigratedLegacyDeviceId,
                ALLOW_NONE));
   }
 };
 
 PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUntrustedAdditionToPrefsAfterWipe,
                        UntrustedAdditionToPrefsAfterWipe);