Create and remove sync nodes whenever preferences flip their managed flag

chrome/browser/sync/glue/preference_change_processor.h

Index: chrome/browser/sync/glue/preference_change_processor.h
diff --git a/chrome/browser/sync/glue/preference_change_processor.h b/chrome/browser/sync/glue/preference_change_processor.h
index ae02708152438aee85ed5fbd8fe48ca439dfbe0e..93c4f6a056c1ea3238999afa9d94e2e59b3a1826 100644
--- a/chrome/browser/sync/glue/preference_change_processor.h
+++ b/chrome/browser/sync/glue/preference_change_processor.h
@@ -58,6 +58,9 @@ class PreferenceChangeProcessor : public ChangeProcessor,
   // The two models should be associated according to this ModelAssociator.
   PreferenceModelAssociator* model_associator_;
 
+  // Whether we are currently processing a preference change notification.
+  bool processing_pref_change_;
+
   DISALLOW_COPY_AND_ASSIGN(PreferenceChangeProcessor);
 };