[remoting android] Remove host It2Me implementation.

remoting/host/android/remoting_host_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 "remoting/host/android/remoting_host_jni_registrar.h"
-
-#include "base/android/jni_android.h"
-#include "base/android/jni_registrar.h"
-#include "base/macros.h"
-#include "remoting/host/android/jni_host.h"
-
-namespace remoting {
-
-namespace {
-const base::android::RegistrationMethod kRemotingRegisteredMethods[] = {
-    {"JniHost", JniHost::RegisterJni},
-};
-}  // namespace
-
-bool RegisterJni(JNIEnv* env) {
-  return RegisterNativeMethods(env, kRemotingRegisteredMethods,
-                               arraysize(kRemotingRegisteredMethods));
-}
-
-}  // namespace remoting