Fire the onchange event when autocompleting usernames for password forms.

chrome/renderer/autofill/password_autofill_manager.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/renderer/autofill/password_autofill_manager.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/common/autofill_messages.h"
@@ skipping 296 matching lines @@
 bool PasswordAutofillManager::DidAcceptAutofillSuggestion(
     const WebKit::WebNode& node,
     const WebKit::WebString& value) {
   WebKit::WebInputElement input;
   PasswordInfo password;
   if (!FindLoginInfo(node, &input, &password))
     return false;
 
   // Set the incoming |value| in the text field and |FillUserNameAndPassword|
   // will do the rest.
-  input.setValue(value);
+  input.setValue(value, true);
   return FillUserNameAndPassword(&input, &password.password_field,
                                  password.fill_data, true, true);
 }
 
 bool PasswordAutofillManager::DidSelectAutofillSuggestion(
     const WebKit::WebNode& node) {
   WebKit::WebInputElement input;
   PasswordInfo password;
   return FindLoginInfo(node, &input, &password);
 }
@@ skipping 304 matching lines @@
   LoginToPasswordInfoMap::iterator iter = login_to_password_info_.find(input);
   if (iter == login_to_password_info_.end())
     return false;
 
   *found_input = input;
   *found_password = iter->second;
   return true;
 }
 
 }  // namespace autofill