[Sync] Migrate bridge implementations to change list based MergeSyncData

components/sync/model/fake_model_type_sync_bridge.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_SYNC_MODEL_FAKE_MODEL_TYPE_SYNC_BRIDGE_H_
 #define COMPONENTS_SYNC_MODEL_FAKE_MODEL_TYPE_SYNC_BRIDGE_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 89 matching lines @@
                  std::unique_ptr<EntityData> entity_data);
 
   // Local data deletion.
   void DeleteItem(const std::string& key);
 
   // ModelTypeSyncBridge implementation
   std::unique_ptr<MetadataChangeList> CreateMetadataChangeList() override;
   base::Optional<ModelError> MergeSyncData(
       std::unique_ptr<MetadataChangeList> metadata_change_list,
       EntityChangeList entity_data) override;
-  base::Optional<ModelError> MergeSyncData(
-      std::unique_ptr<MetadataChangeList> metadata_change_list,
-      EntityDataMap entity_data) override;
   base::Optional<ModelError> ApplySyncChanges(
       std::unique_ptr<MetadataChangeList> metadata_change_list,
       EntityChangeList entity_changes) override;
   void GetData(StorageKeyList storage_keys, DataCallback callback) override;
   void GetAllData(DataCallback callback) override;
   std::string GetClientTag(const EntityData& entity_data) override;
   std::string GetStorageKey(const EntityData& entity_data) override;
   bool SupportsGetStorageKey() const override;
   void SetSupportsGetStorageKey(bool supports_get_storage_key);
   ConflictResolution ResolveConflict(
@@ skipping 32 matching lines @@
 
   // Whether the bridge supports call to GetStorageKey. If it doesn't bridge is
   // responsible for calling UpdateStorageKey when processing new entities in
   // MergeSyncData/ApplySyncChanges.
   bool supports_get_storage_key_ = true;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_MODEL_FAKE_MODEL_TYPE_SYNC_BRIDGE_H_