[protector] Added UI for invalid Preferences backup case.

chrome/browser/protector/protected_prefs_watcher.h

Index: chrome/browser/protector/protected_prefs_watcher.h
diff --git a/chrome/browser/protector/protected_prefs_watcher.h b/chrome/browser/protector/protected_prefs_watcher.h
index d5463a04ad0441bbbea5e824fdffd6ff58167659..9e3ad486cdee3a60b93f31d821f3cfdd5385219e 100644
--- a/chrome/browser/protector/protected_prefs_watcher.h
+++ b/chrome/browser/protector/protected_prefs_watcher.h
@@ -39,6 +39,9 @@ class ProtectedPrefsWatcher : public content::NotificationObserver {
   // instance is owned by the PrefService.
   const base::Value* GetBackupForPref(const std::string& path) const;
 
+  // Updates the backup signature.
+  void UpdateBackupSignature();
+
   // True if the backup was valid at the profile load time.
   bool is_backup_valid() { return is_backup_valid_; }
 
@@ -69,9 +72,6 @@ class ProtectedPrefsWatcher : public content::NotificationObserver {
   // backup has changed.
   bool UpdateBackupEntry(const std::string& pref_name);
 
-  // Updates the backup signature.
-  void UpdateBackupSignature();
-
   // Perform a check that backup is valid and settings have not been modified.
   void ValidateBackup();