Create and remove sync nodes whenever preferences flip their managed flag

chrome/browser/sync/glue/preference_model_associator.h

Index: chrome/browser/sync/glue/preference_model_associator.h
diff --git a/chrome/browser/sync/glue/preference_model_associator.h b/chrome/browser/sync/glue/preference_model_associator.h
index fd2915cbeff85aef417cd8edef4f278bf7016971..0b3bfaaba5079a4ff1f35565b3a5585a00f51994 100644
--- a/chrome/browser/sync/glue/preference_model_associator.h
+++ b/chrome/browser/sync/glue/preference_model_associator.h
@@ -21,6 +21,7 @@ class Value;
 
 namespace sync_api {
 class WriteNode;
+class WriteTransaction;
 }
 
 namespace browser_sync {
@@ -46,6 +47,12 @@ class PreferenceModelAssociator
     return synced_preferences_;
   }
 
+  // Create an association for a given preference. A sync node is created if
+  // necessary and the value is read from or written to the node as appropriate.
+  bool InitPrefNodeAndAssociate(sync_api::WriteTransaction* trans,
+                                const sync_api::BaseNode& root,
+                                const PrefService::Preference* pref);
+
   // PerDataTypeAssociatorInterface implementation.
   //
   // Iterates through the sync model looking for matched pairs of items.