Add a "session only" policy to the content settings.

chrome/browser/content_setting_combo_model.cc

 // Copyright (c) 2010 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/browser/content_setting_combo_model.h"
 
 #include "app/l10n_util.h"
 #include "grit/generated_resources.h"
 
 namespace {
 
 // The settings shown in the combobox if show_ask_ is false;
 const ContentSetting kNoAskSettings[] = { CONTENT_SETTING_ALLOW,
                                           CONTENT_SETTING_BLOCK };
 
 // The settings shown in the combobox if show_ask_ is true;
 const ContentSetting kAskSettings[] = { CONTENT_SETTING_ALLOW,
                                         CONTENT_SETTING_ASK,
+                                        CONTENT_SETTING_SESSION_ONLY,
                                         CONTENT_SETTING_BLOCK };
 
 }  // namespace
 
 ContentSettingComboModel::ContentSettingComboModel(bool show_ask)
     : show_ask_(show_ask) {
 }
 
 ContentSettingComboModel::~ContentSettingComboModel() {
 }
 
 int ContentSettingComboModel::GetItemCount() {
   return show_ask_ ? arraysize(kAskSettings) : arraysize(kNoAskSettings);
 }
 
 std::wstring ContentSettingComboModel::GetItemAt(int index) {
   switch (SettingForIndex(index)) {
     case CONTENT_SETTING_ALLOW:
       return l10n_util::GetString(IDS_EXCEPTIONS_ALLOW_BUTTON);
     case CONTENT_SETTING_BLOCK:
       return l10n_util::GetString(IDS_EXCEPTIONS_BLOCK_BUTTON);
     case CONTENT_SETTING_ASK:
       return l10n_util::GetString(IDS_EXCEPTIONS_ASK_BUTTON);
+    case CONTENT_SETTING_SESSION_ONLY:
+      return l10n_util::GetString(IDS_EXCEPTIONS_SESSION_ONLY_BUTTON);
     default:
       NOTREACHED();
   }
   return std::wstring();
 }
 
 ContentSetting ContentSettingComboModel::SettingForIndex(int index) {
   return show_ask_ ? kAskSettings[index] : kNoAskSettings[index];
 }
 
 int ContentSettingComboModel::IndexForSetting(ContentSetting setting) {
   for (int i = 0; i < GetItemCount(); ++i)
     if (SettingForIndex(i) == setting)
       return i;
   NOTREACHED();
   return 0;
 }