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

chrome/browser/sync/profile_sync_service.h

Index: chrome/browser/sync/profile_sync_service.h
diff --git a/chrome/browser/sync/profile_sync_service.h b/chrome/browser/sync/profile_sync_service.h
index ed483a9cabc9e286e6280a2014b63c714788b9f6..905a093393f9a75055641055d9bc1b67c6160968 100644
--- a/chrome/browser/sync/profile_sync_service.h
+++ b/chrome/browser/sync/profile_sync_service.h
@@ -634,6 +634,10 @@ class ProfileSyncService : public ProfileSyncServiceBase,
   // 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