Remove some illegal enum forward declarations

sandbox/win/src/sync_policy.h

 // Copyright (c) 2006-2008 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 SANDBOX_SRC_SYNC_POLICY_H__
 #define SANDBOX_SRC_SYNC_POLICY_H__
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/strings/string16.h"
 #include "sandbox/win/src/crosscall_server.h"
 #include "sandbox/win/src/nt_internals.h"
 #include "sandbox/win/src/policy_low_level.h"
 #include "sandbox/win/src/sandbox_policy.h"
 
 namespace sandbox {
 
-enum EvalResult;
-
 // This class centralizes most of the knowledge related to sync policy
 class SyncPolicy {
  public:
   // Creates the required low-level policy rules to evaluate a high-level
   // policy rule for sync calls, in particular open or create actions.
   // name is the sync object name, semantics is the desired semantics for the
   // open or create and policy is the policy generator to which the rules are
   // going to be added.
   static bool GenerateRules(const wchar_t* name,
                             TargetPolicy::Semantics semantics,
@@ skipping 11 matching lines @@
   static NTSTATUS OpenEventAction(EvalResult eval_result,
                                   const ClientInfo& client_info,
                                   const base::string16& event_name,
                                   uint32_t desired_access,
                                   HANDLE* handle);
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_SRC_SYNC_POLICY_H__