[Sync] Move data type logic from PSSA to PSS.

components/sync_driver/sync_service.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_DRIVER_SYNC_SERVICE_H_
 #define COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_H_
 
 #include <string>
 
 #include "base/location.h"
@@ skipping 123 matching lines @@
   // The user requests that sync start. This only actually starts sync if
   // IsSyncAllowed is true and the user is signed in. Once sync starts,
   // other things such as HasSyncSetupCompleted being false can still prevent
   // it from moving into the "active" state.
   virtual void RequestStart() = 0;
 
   // Returns the set of types which are preferred for enabling. This is a
   // superset of the active types (see GetActiveDataTypes()).
   virtual syncer::ModelTypeSet GetPreferredDataTypes() const = 0;
 
-  // Called when a user chooses which data types to sync as part of the sync
-  // setup wizard.  |sync_everything| represents whether they chose the
-  // "keep everything synced" option; if true, |chosen_types| will be ignored
-  // and all data types will be synced.  |sync_everything| means "sync all
-  // current and future data types."
+  // Called when a user chooses which data types to sync. |sync_everything|
+  // represents whether they chose the "keep everything synced" option; if
+  // true, |chosen_types| will be ignored and all data types will be synced.
+  // |sync_everything| means "sync all current and future data types."
+  // |chosen_types| must be a subset of syncer::UserSelectableTypes().
   virtual void OnUserChoseDatatypes(bool sync_everything,
                                     syncer::ModelTypeSet chosen_types) = 0;
 
   // Called whe Sync has been setup by the user and can be started.
   virtual void SetSyncSetupCompleted() = 0;
 
   // Returns true if initial sync setup is in progress (does not return true
   // if the user is customizing sync after already completing setup once).
   // SyncService uses this to determine if it's OK to start syncing, or if the
   // user is still setting up the initial sync configuration.
@@ skipping 133 matching lines @@
  protected:
   SyncService() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncService);
 };
 
 }  // namespace sync_driver
 
 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_H_