[chromedriver] Allow commands to be async.

chrome/test/chromedriver/session_map.h

Index: chrome/test/chromedriver/session_map.h
diff --git a/chrome/test/chromedriver/session_map.h b/chrome/test/chromedriver/session_map.h
deleted file mode 100644
index 1af8884f340daaa61819a382dff87f1641d8b3a0..0000000000000000000000000000000000000000
--- a/chrome/test/chromedriver/session_map.h
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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.
-
-#ifndef CHROME_TEST_CHROMEDRIVER_SESSION_MAP_H_
-#define CHROME_TEST_CHROMEDRIVER_SESSION_MAP_H_
-
-#include <string>
-
-#include "base/memory/ref_counted.h"
-#include "chrome/test/chromedriver/synchronized_map.h"
-
-class SessionAccessor;
-
-typedef SynchronizedMap<std::string, scoped_refptr<SessionAccessor> >
-    SessionMap;
-
-#endif  // CHROME_TEST_CHROMEDRIVER_SESSION_MAP_H_