Remove all blimp engine code

blimp/engine/app/blimp_browser_main_parts.h

-// Copyright 2015 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 BLIMP_ENGINE_APP_BLIMP_BROWSER_MAIN_PARTS_H_
-#define BLIMP_ENGINE_APP_BLIMP_BROWSER_MAIN_PARTS_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "blimp/engine/mojo/blob_channel_service.h"
-#include "content/public/browser/browser_main_parts.h"
-#include "content/public/common/main_function_params.h"
-
-namespace net {
-class NetLog;
-}
-
-namespace content {
-struct MainFunctionParams;
-}
-
-namespace blimp {
-
-class BlobChannelSender;
-
-namespace engine {
-
-class BlimpBrowserContext;
-class BlimpEngineConfig;
-class BlimpEngineSession;
-class SettingsManager;
-
-class BlimpBrowserMainParts : public content::BrowserMainParts {
- public:
-  explicit BlimpBrowserMainParts(const content::MainFunctionParams& parameters);
-  ~BlimpBrowserMainParts() override;
-
-  // content::BrowserMainParts implementation.
-  void PreEarlyInitialization() override;
-  void PreMainMessageLoopRun() override;
-  void PostMainMessageLoopRun() override;
-
-  BlimpBrowserContext* GetBrowserContext();
-  SettingsManager* GetSettingsManager();
-  BlobChannelSender* GetBlobChannelSender();
-  BlobChannelService* GetBlobChannelService();
-  BlimpEngineSession* GetBlimpEngineSession();
-
- private:
-  std::unique_ptr<BlimpEngineConfig> engine_config_;
-  std::unique_ptr<net::NetLog> net_log_;
-  std::unique_ptr<SettingsManager> settings_manager_;
-  std::unique_ptr<BlimpEngineSession> engine_session_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlimpBrowserMainParts);
-};
-
-}  // namespace engine
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_APP_BLIMP_BROWSER_MAIN_PARTS_H_