Use the new java_cpp_enum rule in net.

net/base/mime_util.h

Index: net/base/mime_util.h
diff --git a/net/base/mime_util.h b/net/base/mime_util.h
index 3275464676460737ff5a0a48b09b148ed76a7a35..24dca3def6e928d98d46b1b3a1d15c8a450fe0c4 100644
--- a/net/base/mime_util.h
+++ b/net/base/mime_util.h
@@ -147,10 +147,14 @@ NET_EXPORT void RemoveProprietaryMediaTypesAndCodecsForTests();
 NET_EXPORT const std::string GetIANAMediaType(const std::string& mime_type);
 
 // A list of supported certificate-related mime types.
+//
+// A Java counterpart will be generated for this enum.
+// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.net
 enum CertificateMimeType {
-#define CERTIFICATE_MIME_TYPE(name, value) CERTIFICATE_MIME_TYPE_ ## name = value,
-#include "net/base/mime_util_certificate_type_list.h"
-#undef CERTIFICATE_MIME_TYPE
+  CERTIFICATE_MIME_TYPE_UNKNOWN,
+  CERTIFICATE_MIME_TYPE_X509_USER_CERT,
+  CERTIFICATE_MIME_TYPE_X509_CA_CERT,
+  CERTIFICATE_MIME_TYPE_PKCS12_ARCHIVE,
 };
 
 NET_EXPORT CertificateMimeType GetCertificateMimeTypeForMimeType(