Simplify devtools code on android and enable devtools for android content_shell.

content/browser/android/remote_debugging_controller.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/browser/android/remote_debugging_controller.h"
-
-#include <jni.h>
-
-#include "content/public/browser/android/devtools_server.h"
-#include "jni/RemoteDebuggingController_jni.h"
-
-namespace content {
-
-static void StartRemoteDebugging(JNIEnv*, jclass) {
-  DevToolsServer::GetInstance()->Start();
-}
-
-static void StopRemoteDebugging(JNIEnv* , jclass) {
-  DevToolsServer::GetInstance()->Stop();
-}
-
-static jboolean IsRemoteDebuggingEnabled(JNIEnv*, jclass) {
-  return DevToolsServer::GetInstance()->IsStarted();
-}
-
-bool RegisterRemoteDebuggingController(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
-}  // namespace content