Fix invalid combobox painting issue in requestAutocomplete() dialog.

ui/views/controls/combobox/combobox.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 "ui/views/controls/combobox/combobox.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "ui/base/accessibility/accessible_view_state.h"
@@ skipping 122 matching lines @@
     }
   }
   return false;
 }
 
 void Combobox::SetAccessibleName(const string16& name) {
   accessible_name_ = name;
 }
 
 void Combobox::SetInvalid(bool invalid) {
+  if (invalid == invalid_)
+    return;
+
   invalid_ = invalid;
-  if (invalid) {
+  if (invalid_) {
     text_border_->SetColor(kWarningColor);
     set_background(new InvalidBackground());
   } else {
     text_border_->UseDefaultColor();
     set_background(NULL);
   }
+  SchedulePaint();
 }
 
 ui::TextInputClient* Combobox::GetTextInputClient() {
   if (!selector_)
     selector_.reset(new PrefixSelector(this));
   return selector_.get();
 }
 
 
 bool Combobox::IsItemChecked(int id) const {
@@ skipping 307 matching lines @@
 
 int Combobox::MenuCommandToIndex(int menu_command_id) const {
   // (note that the id received is offset by kFirstMenuItemId)
   // Revert menu ID offset to map back to combobox model.
   int index = menu_command_id - kFirstMenuItemId;
   DCHECK_LT(index, model()->GetItemCount());
   return index;
 }
 
 }  // namespace views