Use the new java_cpp_enum rule in net.

net/android/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 
 android_library("net_java") {
   DEPRECATED_java_in_dir = "java/src"
   deps = [
     "//base:base_java",
   ]
 
   srcjar_deps = [
-    ":cert_verify_status_android_java",
-    ":certificate_mime_types_java",
     ":net_errors_java",
-    ":private_key_types_java",
+    ":net_android_java_enums_srcjar",
     ":remote_android_keystore_aidl",
   ]
 }
 
 android_aidl("remote_android_keystore_aidl") {
   interface_file = "java/src/org/chromium/net/IRemoteAndroidKeyStoreInterface.aidl"
   sources = [
     "java/src/org/chromium/net/IRemoteAndroidKeyStore.aidl",
     "java/src/org/chromium/net/IRemoteAndroidKeyStoreCallbacks.aidl",
   ]
@@ skipping 15 matching lines @@
 java_cpp_template("net_errors_java") {
   package_name = "org/chromium/net"
   sources = [
     "java/NetError.template",
   ]
   inputs = [
     "../base/net_error_list.h"
   ]
 }
 
-java_cpp_template("certificate_mime_types_java") {
-  package_name = "org/chromium/net"
+java_cpp_enum("net_android_java_enums_srcjar") {
   sources = [
-    "java/CertificateMimeType.template",
+    "../base/mime_util.h",
+    "cert_verify_result_android.h",
+    "keystore.h"
   ]
-  inputs = [
-    "../base/mime_util_certificate_type_list.h"
+  outputs = [
+    "org/chromium/net/CertificateMimeType.java",
+    "org/chromium/net/CertVerifyStatusAndroid.java",
+    "org/chromium/net/PrivateKeyType.java",
   ]
 }
 
-java_cpp_template("cert_verify_status_android_java") {
-  package_name = "org/chromium/net"
-  sources = [
-    "java/CertVerifyStatusAndroid.template",
-  ]
-  inputs = [
-    "cert_verify_status_android_list.h"
-  ]
-}
-
-java_cpp_template("private_key_types_java") {
-  package_name = "org/chromium/net"
-  sources = [
-    "java/PrivateKeyType.template",
-  ]
-  inputs = [
-    "private_key_type_list.h"
-  ]
-}
-
 # TODO(GYP)
 if (false) {
   unittest_apk("net_unittests_apk") {
     deps = [
       ":net_java",
       ":net_javatests",
       "//net:net_unittests",
     ]
     unittests_dep = "//net:net_unittests"
   }
 }