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

content/public/browser/android/devtools_server.h

-// 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.
-
-#ifndef CONTENT_PUBLIC_BROWSER_ANDROID_DEVTOOLS_SERVER_H_
-#define CONTENT_PUBLIC_BROWSER_ANDROID_DEVTOOLS_SERVER_H_
-
-#include <string>
-
-#include "base/callback_forward.h"
-
-namespace net {
-class URLRequestContextGetter;
-}
-
-namespace content {
-
-class DevToolsHttpHandlerDelegate;
-
-// This class controls Developer Tools remote debugging server.
-class DevToolsServer {
- public:
-  // A callback being called each time the server restarts.
-  // The delegate instance is deleted on server stop, so the creator must
-  // provide the new instance on each call.
-  typedef base::Callback<content::DevToolsHttpHandlerDelegate*(void)>
-      DelegateCreator;
-
-  // Returns the singleton instance (and initializes it if necessary).
-  static DevToolsServer* GetInstance();
-
-  // Initializes the server. Must be called prior to the first call of |Start|.
-  virtual void Init(const std::string& frontend_version,
-                    net::URLRequestContextGetter* url_request_context,
-                    const DelegateCreator& delegate_creator) = 0;
-
-  // Opens linux abstract socket to be ready for remote debugging.
-  virtual void Start() = 0;
-
-  // Closes debugging socket, stops debugging.
-  virtual void Stop() = 0;
-
-  virtual bool IsInitialized() const = 0;
-
-  virtual bool IsStarted() const = 0;
-
- protected:
-  virtual ~DevToolsServer() {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_BROWSER_ANDROID_DEVTOOLS_SERVER_H_