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..ff53cf466a3d285df76a418cce37ef8d0c10c423 100644
--- a/chrome/browser/prefs/pref_hash_filter.h
+++ b/chrome/browser/prefs/pref_hash_filter.h
@@ -19,6 +19,7 @@
 #include "chrome/browser/prefs/tracked/tracked_preference.h"
 
 class PrefService;
+class PersistentPrefStore;
 class PrefStore;
 
 namespace base {
@@ -83,6 +84,13 @@ 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.

[robertshield, 2014/03/25 03:05:12]

This will also unconditionally remove tracked preferences from |source| will it
not?

[erikwright (departed), 2014/03/25 20:28:26]

Done.

+  void MigrateValues(PersistentPrefStore* source,
+                     PersistentPrefStore* destination);
+
   // PrefFilter implementation.
   virtual void FilterOnLoad(base::DictionaryValue* pref_store_contents)
       OVERRIDE;