[Sync] Convert syncable/ directory to ModelEnumSet

chrome/browser/sync/sessions/session_state.h

 // Copyright (c) 2011 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.
 
 // The 'sessions' namespace comprises all the pieces of state that are
 // combined to form a SyncSession instance. In that way, it can be thought of
 // as an extension of the SyncSession type itself. Session scoping gives
 // context to things like "conflict progress", "update progress", etc, and the
 // separation this file provides allows clients to only include the parts they
 // need rather than the entire session stack.
@@ skipping 301 matching lines @@
 // a singleton with respect to model types.
 struct AllModelTypeState {
   explicit AllModelTypeState(bool* dirty_flag);
   ~AllModelTypeState();
 
   // Commits for all model types are bundled together into a single message.
   ClientToServerMessage commit_message;
   ClientToServerResponse commit_response;
   // We GetUpdates for some combination of types at once.
   // requested_update_types stores the set of types which were requested.
-  syncable::ModelTypeBitSet updates_request_types;
+  syncable::ModelEnumSet updates_request_types;
   ClientToServerResponse updates_response;
   // Used to build the shared commit message.
   DirtyOnWrite<std::vector<int64> > unsynced_handles;
   DirtyOnWrite<SyncerStatus> syncer_status;
   DirtyOnWrite<ErrorCounters> error;
   SyncCycleControlParameters control_params;
   DirtyOnWrite<int64> num_server_changes_remaining;
   OrderedCommitSet commit_set;
 };
 
 // Grouping of all state that applies to a single ModelSafeGroup.
 struct PerModelSafeGroupState {
   explicit PerModelSafeGroupState(bool* dirty_flag);
   ~PerModelSafeGroupState();
 
   UpdateProgress update_progress;
   ConflictProgress conflict_progress;
 };
 
 }  // namespace sessions
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SESSION_STATE_H_