Remove implicit update when adding a listener in passwords private API.

chrome/common/extensions/api/passwords_private.idl

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Use the <code>chrome.passwordsPrivate</code> API to add or remove password
 // data from the settings UI.
 namespace passwordsPrivate {
   // Pair of origin URL and login saved for that URL.
   dictionary LoginPair {
     // The human-readable origin for the URL where the password is used.
@@ skipping 58 matching lines @@
     // |callback|: Called with the list of saved passwords.
     static void getSavedPasswordList(PasswordListCallback callback);
 
     // Returns the list of password exceptions.
     // |callback|: Called with the list of password exceptions.
     static void getPasswordExceptionList(ExceptionListCallback callback);
   };
 
   interface Events {
     // Fired when the saved passwords list has changed, meaning that an entry
-    // has been added or removed. Note that this event fires as soon as a
-    //  listener is added.
+    // has been added or removed.
     //
     // |entries|: The updated list of password entries.
     static void onSavedPasswordsListChanged(PasswordUiEntry[] entries);
 
     // Fired when the password exceptions list has changed, meaning that an
-    // entry has been added or removed. Note that this event fires as soon as a
-    // listener is added.
+    // entry has been added or removed.
     //
     // |exceptions|: The updated list of password exceptions.
     static void onPasswordExceptionsListChanged(DOMString[] exceptions);
 
     // Fired when a plaintext password has been fetched in response to a call to
     // chrome.passwordsPrivate.requestPlaintextPassword().
     //
     // |loginPair|: The LoginPair whose password was found.
     // |plaintextPassword|: The plaintext password which was retrieved.
     static void onPlaintextPasswordRetrieved(
         PlaintextPasswordEventParameters dict);
   };
 };