Move basic API permissions code out of //chrome

chrome/common/extensions/permissions/permission_message_util.h

-// 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_COMMON_EXTENSIONS_PERMISSIONS_PERMISSION_MESSAGE_UTIL_H_
-#define CHROME_COMMON_EXTENSIONS_PERMISSIONS_PERMISSION_MESSAGE_UTIL_H_
-
-#include <set>
-#include <string>
-
-namespace extensions {
-class PermissionMessage;
-class PermissionSet;
-class URLPatternSet;
-}
-
-namespace permission_message_util {
-
-// Creates the corresponding permission message for a list of hosts.
-// The messages change depending on what hosts are present.
-extensions::PermissionMessage CreateFromHostList(
-    const std::set<std::string>& hosts);
-
-std::set<std::string> GetDistinctHosts(
-    const extensions::URLPatternSet& host_patterns,
-    bool include_rcd,
-    bool exclude_file_scheme);
-
-}  // namespace permission_message_util
-
-#endif  // CHROME_COMMON_EXTENSIONS_PERMISSIONS_PERMISSION_MESSAGE_UTIL_H_