Session-only local storage cleared on exit.

chrome/browser/extensions/mock_extension_special_storage_policy.cc

 // Copyright (c) 2011 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/extensions/mock_extension_special_storage_policy.h"
 
-MockExtensionSpecialStoragePolicy::MockExtensionSpecialStoragePolicy() {}
+MockExtensionSpecialStoragePolicy::MockExtensionSpecialStoragePolicy()
+    : ExtensionSpecialStoragePolicy(NULL) {}
+
 MockExtensionSpecialStoragePolicy::~MockExtensionSpecialStoragePolicy() {}
 
 bool MockExtensionSpecialStoragePolicy::IsStorageProtected(const GURL& origin) {
   return protected_.find(origin) != protected_.end();
 }
 
 bool MockExtensionSpecialStoragePolicy::IsStorageUnlimited(const GURL& origin) {
   return unlimited_.find(origin) != unlimited_.end();
 }
 
+bool MockExtensionSpecialStoragePolicy::IsStorageSessionOnly(
+    const GURL& origin) {
+  return session_only_.find(origin) != session_only_.end();
+}
+
 bool MockExtensionSpecialStoragePolicy::IsFileHandler(
     const std::string& extension_id) {
   return file_handlers_.find(extension_id) != file_handlers_.end();
 }