Remove some dead code about "acknowledged types"

components/sync_driver/sync_prefs_unittest.cc

 // Copyright (c) 2012 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 "components/sync_driver/sync_prefs.h"
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_notifier_impl.h"
 #include "base/prefs/pref_value_store.h"
@@ skipping 183 matching lines @@
   sync_prefs.AddSyncPrefObserver(&mock_sync_pref_observer);
 
   sync_prefs.SetManagedForTest(true);
   EXPECT_TRUE(sync_prefs.IsManaged());
   sync_prefs.SetManagedForTest(false);
   EXPECT_FALSE(sync_prefs.IsManaged());
 
   sync_prefs.RemoveSyncPrefObserver(&mock_sync_pref_observer);
 }
 
-TEST_F(SyncPrefsTest, AcknowledgeSyncedTypes) {
-  SyncPrefs sync_prefs(&pref_service_);
-
-  syncer::ModelTypeSet expected_acknowledge_synced_types =
-      sync_prefs.GetAcknowledgeSyncedTypesForTest();
-  for (int i = syncer::EXTENSION_SETTINGS; i < syncer::MODEL_TYPE_COUNT; ++i) {
-    const syncer::ModelType type = syncer::ModelTypeFromInt(i);
-    syncer::ModelTypeSet acknowledge_synced_types(type);
-    expected_acknowledge_synced_types.Put(type);
-    sync_prefs.AcknowledgeSyncedTypes(acknowledge_synced_types);
-    EXPECT_TRUE(expected_acknowledge_synced_types.Equals(
-        sync_prefs.GetAcknowledgeSyncedTypesForTest()));
-  }
-}
-
 TEST_F(SyncPrefsTest, ClearPreferences) {
   SyncPrefs sync_prefs(&pref_service_);
 
   EXPECT_FALSE(sync_prefs.HasSyncSetupCompleted());
   EXPECT_EQ(base::Time(), sync_prefs.GetLastSyncedTime());
   EXPECT_TRUE(sync_prefs.GetEncryptionBootstrapToken().empty());
 
   sync_prefs.SetSyncSetupCompleted();
   sync_prefs.SetLastSyncedTime(base::Time::Now());
   sync_prefs.SetEncryptionBootstrapToken("token");
@@ skipping 18 matching lines @@
   EXPECT_TRUE(sync_prefs.GetPreferredDataTypes(syncer::UserTypes())
                   .Has(syncer::DEVICE_INFO));
   sync_prefs.SetKeepEverythingSynced(false);
   EXPECT_TRUE(sync_prefs.GetPreferredDataTypes(syncer::UserTypes())
                   .Has(syncer::DEVICE_INFO));
 }
 
 }  // namespace
 
 }  // namespace sync_driver