Remove some illegal enum forward declarations

sandbox/win/src/process_thread_policy.h

 // Copyright (c) 2006-2010 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_PROCESS_THREAD_POLICY_H_
 #define SANDBOX_SRC_PROCESS_THREAD_POLICY_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "sandbox/win/src/policy_low_level.h"
 
 #include "base/strings/string16.h"
 #include "sandbox/win/src/crosscall_server.h"
 #include "sandbox/win/src/sandbox_policy.h"
 
 namespace sandbox {
 
-enum EvalResult;
-
 // This class centralizes most of the knowledge related to process execution.
 class ProcessPolicy {
  public:
   // Creates the required low-level policy rules to evaluate a high-level.
   // policy rule for process creation
   // 'name' is the executable to be spawn.
   // 'semantics' is the desired semantics.
   // '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 55 matching lines @@
                                   PVOID parameter,
                                   DWORD creation_flags,
                                   LPDWORD thread_id,
                                   HANDLE* handle);
 };
 
 }  // namespace sandbox
 
 
 #endif  // SANDBOX_SRC_PROCESS_THREAD_POLICY_H_