Separate storage for protected preferences into Protected Preferences file.

chrome/browser/prefs/pref_hash_filter.h

Index: chrome/browser/prefs/pref_hash_filter.h
diff --git a/chrome/browser/prefs/pref_hash_filter.h b/chrome/browser/prefs/pref_hash_filter.h
index 753293c2980c8848c639f563e882d7b619a9e9a0..c4353fadd07764aefbdfc1d49f31eca993013c9f 100644
--- a/chrome/browser/prefs/pref_hash_filter.h
+++ b/chrome/browser/prefs/pref_hash_filter.h
@@ -18,6 +18,7 @@
 #include "chrome/browser/prefs/pref_hash_store.h"
 #include "chrome/browser/prefs/tracked/tracked_preference.h"
 
+class PersistentPrefStore;
 class PrefService;
 class PrefStore;
 
@@ -83,6 +84,15 @@ class PrefHashFilter : public PrefFilter {
   // |pref_store|.
   void Initialize(const PrefStore& pref_store);
 
+  // Migrates protected values from |source| to |destination|. Values are
+  // migrated if they are protected according to this filter's configuration,
+  // the corresponding key has no value in |destination|, and the value in
+  // |source| is trusted according to this filter's PrefHashStore. Regardless of
+  // the state of |destination| or the trust status, the protected values will
+  // be removed from |source|.
+  void MigrateValues(PersistentPrefStore* source,
+                     PersistentPrefStore* destination);
+
   // PrefFilter implementation.
   virtual void FilterOnLoad(base::DictionaryValue* pref_store_contents)
       OVERRIDE;