Disable checkboxes in the advanced sync settings overlay whose type is force-enabled.

chrome/browser/sync/profile_sync_service.h

 // Copyright (c) 2012 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 CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 616 matching lines @@
   // 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;
 
   // Returns the set of directory types which are preferred for enabling.
   virtual syncer::ModelTypeSet GetPreferredDirectoryDataTypes() const;
 
   // Returns the set of off-thread types which are preferred for enabling.
   virtual syncer::ModelTypeSet GetPreferredNonBlockingDataTypes() const;
 
+  // Returns the set of types which are enforced programmatically and can not
+  // be disabled by the user.
+  virtual syncer::ModelTypeSet GetForcedDataTypes() const;
+
   // Gets the set of all data types that could be allowed (the set that
   // should be advertised to the user).  These will typically only change
   // via a command-line option.  See class comment for more on what it means
   // for a datatype to be Registered.
   virtual syncer::ModelTypeSet GetRegisteredDataTypes() const;
 
   // Gets the set of directory types which could be allowed.
   virtual syncer::ModelTypeSet GetRegisteredDirectoryDataTypes() const;
 
   // Gets the set of off-thread types which could be allowed.
@@ skipping 518 matching lines @@
   BrowsingDataRemover::Observer* browsing_data_remover_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_