Fix for Bug 50726 "Save extension list and "winning" prefs from extensions"

chrome/browser/prefs/pref_value_store.h

Index: chrome/browser/prefs/pref_value_store.h
diff --git a/chrome/browser/prefs/pref_value_store.h b/chrome/browser/prefs/pref_value_store.h
index 87ed7b26b635cbfb6517d0b6d316a3d22c395e49..7666d6ea0d8205e2a8d787a04d607faac7268989 100644
--- a/chrome/browser/prefs/pref_value_store.h
+++ b/chrome/browser/prefs/pref_value_store.h
@@ -172,7 +172,14 @@ class PrefValueStore : public base::RefCountedThreadSafe<PrefValueStore> {
   // that conflict with proxy settings specified by proxy policy.
   bool HasPolicyConflictingUserProxySettings();
 
-      protected:
+  // Replaces the internal link to the extension preferences store and takes
+  // ownership of |extension_prefs|.
+  void ReplaceExtensionPrefStore(PrefStore* extension_prefs);
+
+  // Returns a reference to the extension pref store for write access.
+  PrefStore* GetExtensionPrefStore();
+
+ protected:
   // In decreasing order of precedence:
   //   |managed_platform_prefs| contains all managed platform (non-cloud policy)
   //        preference values.