[Sync] DeviceInfoService static method and error cleanup.

components/sync/device_info/device_info_service.h

Index: components/sync/device_info/device_info_service.h
diff --git a/components/sync/device_info/device_info_service.h b/components/sync/device_info/device_info_service.h
index c5156d07b0b56cc1db3161d4967054936b5ba1b8..952f2f82374cad5b6d5d9b6e96160f1346c6ce83 100644
--- a/components/sync/device_info/device_info_service.h
+++ b/components/sync/device_info/device_info_service.h
@@ -75,16 +75,6 @@ class DeviceInfoService : public ModelTypeService, public DeviceInfoTracker {
   using ClientIdToSpecifics =
       std::map<std::string, std::unique_ptr<sync_pb::DeviceInfoSpecifics>>;
 
-  static std::unique_ptr<sync_pb::DeviceInfoSpecifics> CopyToSpecifics(
-      const DeviceInfo& info);
-
-  // Allocate new DeviceInfo from SyncData.
-  static std::unique_ptr<DeviceInfo> CopyToModel(
-      const sync_pb::DeviceInfoSpecifics& specifics);
-  // Conversion as we prepare to hand data to the processor.
-  static std::unique_ptr<EntityData> CopyToEntityData(
-      const sync_pb::DeviceInfoSpecifics& specifics);
-
   // Store SyncData in the cache and durable storage.
   void StoreSpecifics(std::unique_ptr<sync_pb::DeviceInfoSpecifics> specifics,
                       ModelTypeStore::WriteBatch* batch);
@@ -139,10 +129,6 @@ class DeviceInfoService : public ModelTypeService, public DeviceInfoTracker {
   // datatype, since these errors prevent us from knowing if sync is enabled.
   void ReportStartupErrorToSync(const std::string& msg);
 
-  // Find the timestamp for the last time this |device_info| was edited.
-  static base::Time GetLastUpdateTime(
-      const sync_pb::DeviceInfoSpecifics& specifics);
-
   // |local_device_info_provider_| isn't owned.
   const LocalDeviceInfoProvider* const local_device_info_provider_;