Clear session-only data when all browser windows are closed.

chrome/browser/sessions/session_data_deleter.h

Index: chrome/browser/sessions/session_data_deleter.h
diff --git a/chrome/browser/sessions/session_data_deleter.h b/chrome/browser/sessions/session_data_deleter.h
new file mode 100644
index 0000000000000000000000000000000000000000..710cd7e41ecc60a065534c5b76a5fa0f04f335f1
--- /dev/null
+++ b/chrome/browser/sessions/session_data_deleter.h
@@ -0,0 +1,15 @@
+// Copyright 2013 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.
+
+#ifndef CHROME_BROWSER_SESSIONS_SESSION_DATA_DELETER_H_
+#define CHROME_BROWSER_SESSIONS_SESSION_DATA_DELETER_H_
+
+class Profile;
+
+// Clears cookies and local storage for origins that are session-only and clears
+// session cookies unless the startup preference is to continue the previous
+// session.
+void DeleteSessionOnlyData(Profile* profile);
+
+#endif  // CHROME_BROWSER_SESSIONS_SESSION_DATA_DELETER_H_