Remove some illegal enum forward declarations

sandbox/win/src/interception_internal.h

Index: sandbox/win/src/interception_internal.h
diff --git a/sandbox/win/src/interception_internal.h b/sandbox/win/src/interception_internal.h
index 45a0557e5efebe6122a54d959306fb77856b3df2..390bd9eb1295a0fc16ba07fc7fc31ce53be09b01 100644
--- a/sandbox/win/src/interception_internal.h
+++ b/sandbox/win/src/interception_internal.h
@@ -11,14 +11,13 @@
 
 #include <stddef.h>
 
+#include "sandbox/win/src/interceptors.h"
 #include "sandbox/win/src/sandbox_types.h"
 
 namespace sandbox {
 
 const int kMaxThunkDataBytes = 64;
 
-enum InterceptorId;
-
 // The following structures contain variable size fields at the end, and will be
 // used to transfer information between two processes. In order to guarantee
 // our ability to follow the chain of structures, the alignment should be fixed,