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

chrome/browser/renderer_host/database_dispatcher_host.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/renderer_host/database_dispatcher_host.h"
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #endif
 
@@ skipping 403 matching lines @@
     Send(new ViewMsg_SignalCookiePromptEvent());
     return;
   }
 
   AllowDatabaseResponse(reply_msg, content_setting);
 }
 
 void DatabaseDispatcherHost::AllowDatabaseResponse(
     IPC::Message* reply_msg, ContentSetting content_setting) {
   DCHECK((content_setting == CONTENT_SETTING_ALLOW) ||
-         (content_setting == CONTENT_SETTING_BLOCK));
+         (content_setting == CONTENT_SETTING_BLOCK) ||
+         (content_setting == CONTENT_SETTING_SESSION_ONLY));
   ViewHostMsg_AllowDatabase::WriteReplyParams(
-      reply_msg, content_setting == CONTENT_SETTING_ALLOW);
+      reply_msg, content_setting != CONTENT_SETTING_BLOCK);
   Send(reply_msg);
 }
 
 void DatabaseDispatcherHost::DatabaseClosed(const string16& origin_identifier,
                                             const string16& database_name) {
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::FILE));
   if (!database_connections_.IsDatabaseOpened(
           origin_identifier, database_name)) {
     ReceivedBadMessage(ViewHostMsg_DatabaseClosed::ID);
     return;
@@ skipping 14 matching lines @@
                                         database_size, space_available));
   }
 }
 
 void DatabaseDispatcherHost::OnDatabaseScheduledForDeletion(
     const string16& origin_identifier,
     const string16& database_name) {
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::FILE));
   Send(new ViewMsg_DatabaseCloseImmediately(origin_identifier, database_name));
 }