Remove some illegal enum forward declarations

sandbox/win/src/sandbox_types.h

 // 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 SANDBOX_WIN_SRC_SANDBOX_TYPES_H_
 #define SANDBOX_WIN_SRC_SANDBOX_TYPES_H_
 
 #include "base/process/kill.h"
 #include "base/process/launch.h"
 
 namespace sandbox {
 
 // Operation result codes returned by the sandbox API.
 //
 // Note: These codes are listed in a histogram and any new codes should be added
-// at the end.
+// at the end. If the underlying type is changed then the forward declaration in
+// sandbox_init.h must be updated.
 //
 enum ResultCode : int {
   SBOX_ALL_OK = 0,
   // Error is originating on the win32 layer. Call GetlastError() for more
   // information.
   SBOX_ERROR_GENERIC = 1,
   // An invalid combination of parameters was given to the API.
   SBOX_ERROR_BAD_PARAMS = 2,
   // The desired operation is not supported at this time.
   SBOX_ERROR_UNSUPPORTED = 3,
@@ skipping 122 matching lines @@
   INTERCEPTION_EAT,
   INTERCEPTION_SIDESTEP,        // Preamble patch
   INTERCEPTION_SMART_SIDESTEP,  // Preamble patch but bypass internal calls
   INTERCEPTION_UNLOAD_MODULE,   // Unload the module (don't patch)
   INTERCEPTION_LAST             // Placeholder for last item in the enumeration
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_WIN_SRC_SANDBOX_TYPES_H_