Revert of Multiprocess test client: Android child process launcher rework.

base/test/android/test_support_jni_registrar.cc

-// Copyright 2016 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.
-
-#include "base/test/android/test_support_jni_registrar.h"
-
-#include "base/android/jni_registrar.h"
-#include "base/test/android/multiprocess_test_client_service.h"
-#include "base/test/multiprocess_test.h"
-
-namespace base {
-namespace android {
-
-static RegistrationMethod kBaseTestSupportRegisteredMethods[] = {
-    {"MultiprocessTestClientService", RegisterMultiprocessTestClientServiceJni},
-};
-
-bool RegisterTestSupportJni(JNIEnv* env) {
-  return RegisterNativeMethods(env, kBaseTestSupportRegisteredMethods,
-                               arraysize(kBaseTestSupportRegisteredMethods));
-}
-
-}  // namespace android
-}  // namespace base