Remove unneeded JNI registrations.

content/app/android/app_jni_registrar.cc

 // 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.
 
 #include "content/app/android/app_jni_registrar.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "content/app/android/child_process_service.h"
-#include "content/app/android/content_main.h"
 
 namespace {
 
 base::android::RegistrationMethod kContentRegisteredMethods[] = {
-  { "ContentMain", content::RegisterContentMain },
   { "ChildProcessService", content::RegisterChildProcessService },
 };
 
 }  // namespace
 
 namespace content {
 namespace android {
 
 bool RegisterAppJni(JNIEnv* env) {
   return RegisterNativeMethods(env, kContentRegisteredMethods,
                                arraysize(kContentRegisteredMethods));
 }
 
 }  // namespace android
 }  // namespace content