Remove redundant code to sync diff

lib/services/sync_service.dart

@@ -158,32 +158,13 @@ class SyncService {
     if (!Configuration.instance.hasConfiguredAccount()) {
       return Future.error("Account not configured yet");
     }
+    // TODO: Verify flow starting here
     await CollectionsService.instance.sync();
-    await _persistFilesDiff();
     await _persistEncryptedFilesDiff();
     await _uploadDiff();
     await _deletePhotosOnServer();
   }
 
-  Future<void> _persistFilesDiff() async {
-    final diff = await _downloader.getFilesDiff(_getSyncTime(), _diffLimit);
-    if (diff != null && diff.isNotEmpty) {
-      await _storeDiff(diff, _syncTimeKey);
-      FileRepository.instance.reloadFiles();
-      if (diff.length == _diffLimit) {
-        return await _persistFilesDiff();
-      }
-    }
-  }
-
-  int _getSyncTime() {
-    var syncTime = _prefs.getInt(_syncTimeKey);
-    if (syncTime == null) {
-      syncTime = 0;
-    }
-    return syncTime;
-  }
-
   Future<void> _persistEncryptedFilesDiff() async {
     final diff = await _downloader.getEncryptedFilesDiff(
         _getEncryptedFilesSyncTime(), _diffLimit);

lib/utils/file_downloader.dart

@@ -18,8 +18,9 @@ class DiffFetcher {
     return _dio
         .get(
           Configuration.instance.getHttpEndpoint() + "/files/diff",
+          options: Options(
+              headers: {"X-Auth-Token": Configuration.instance.getToken()}),
           queryParameters: {
-            "token": Configuration.instance.getToken(),
             "sinceTime": lastSyncTime,
             "limit": limit,
           },
@@ -60,25 +61,4 @@ class DiffFetcher {
           return files;
         });
   }
-
-  Future<List<File>> getFilesDiff(int lastSyncTime, int limit) async {
-    Response response = await _dio.get(
-      Configuration.instance.getHttpEndpoint() + "/files/diff",
-      options:
-          Options(headers: {"X-Auth-Token": Configuration.instance.getToken()}),
-      queryParameters: {
-        "sinceTime": lastSyncTime,
-        "limit": limit,
-      },
-    ).catchError((e) => _logger.severe(e));
-    if (response != null) {
-      Bus.instance.fire(RemoteSyncEvent(true));
-      return (response.data["diff"] as List)
-          .map((file) => new File.fromJson(file))
-          .toList();
-    } else {
-      Bus.instance.fire(RemoteSyncEvent(false));
-      return null;
-    }
-  }
 }