Remove all blimp engine code

blimp/engine/app/blimp_content_main_delegate.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_CONTENT_MAIN_DELEGATE_H_
-#define BLIMP_ENGINE_APP_BLIMP_CONTENT_MAIN_DELEGATE_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "blimp/engine/common/blimp_content_client.h"
-#include "content/public/app/content_main_delegate.h"
-
-namespace blimp {
-namespace engine {
-
-class BlimpContentBrowserClient;
-class BlimpContentRendererClient;
-
-class BlimpContentMainDelegate : public content::ContentMainDelegate {
- public:
-  BlimpContentMainDelegate();
-  ~BlimpContentMainDelegate() override;
-
-  BlimpContentBrowserClient* browser_client() { return browser_client_.get(); }
-
-  // content::ContentMainDelegate implementation.
-  bool BasicStartupComplete(int* exit_code) override;
-  void PreSandboxStartup() override;
-  content::ContentBrowserClient* CreateContentBrowserClient() override;
-  content::ContentRendererClient* CreateContentRendererClient() override;
-
- private:
-  void InitializeResourceBundle();
-
-  std::unique_ptr<BlimpContentBrowserClient> browser_client_;
-  std::unique_ptr<BlimpContentRendererClient> renderer_client_;
-  BlimpContentClient content_client_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlimpContentMainDelegate);
-};
-
-}  // namespace engine
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_APP_BLIMP_CONTENT_MAIN_DELEGATE_H_