Move the cookie store implementation into its own directory.

net/cookies/cookie_util.h

Index: net/cookies/cookie_util.h
diff --git a/net/base/cookie_util.h b/net/cookies/cookie_util.h
similarity index 92%
copy from net/base/cookie_util.h
copy to net/cookies/cookie_util.h
index bda52f096c843c25c06471e7fd8e91d1ea72c595..443111bae02d34bc29fec14ccc1243c3e9542a17 100644
--- a/net/base/cookie_util.h
+++ b/net/cookies/cookie_util.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NET_BASE_COOKIE_UTIL_H_
-#define NET_BASE_COOKIE_UTIL_H_
+#ifndef NET_COOKIES_COOKIE_UTIL_H_
+#define NET_COOKIES_COOKIE_UTIL_H_
 #pragma once
 
 #include <string>
@@ -37,4 +37,4 @@ NET_EXPORT bool DomainIsHostOnly(const std::string& domain_string);
 }  // namspace cookie_util
 }  // namespace net
 
-#endif  // NET_BASE_COOKIE_UTIL_H_
+#endif  // NET_COOKIES_COOKIE_UTIL_H_