Add synchronous callback support to important_file_writer.cc

components/prefs/json_pref_store.h

Index: components/prefs/json_pref_store.h
diff --git a/components/prefs/json_pref_store.h b/components/prefs/json_pref_store.h
index 047fe74abcd88857597e7ac0d398274820de5b7d..6fa5d8ac2fb3c5405cf162584451d2cf1815f9e9 100644
--- a/components/prefs/json_pref_store.h
+++ b/components/prefs/json_pref_store.h
@@ -106,10 +106,10 @@ class COMPONENTS_PREFS_EXPORT JsonPrefStore
   // cleanup that shouldn't otherwise alert observers.
   void RemoveValueSilently(const std::string& key, uint32_t flags);
 
-  // Registers |on_next_successful_write| to be called once, on the next
+  // Registers |on_next_successful_write_reply| to be called once, on the next
   // successful write event of |writer_|.
-  void RegisterOnNextSuccessfulWriteCallback(
-      const base::Closure& on_next_successful_write);
+  void RegisterOnNextSuccessfulWriteReply(
+      const base::Closure& on_next_successful_write_reply);
 
   void ClearMutableValues() override;