Remove all blimp engine code

blimp/engine/app/blimp_network_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_NETWORK_DELEGATE_H_
-#define BLIMP_ENGINE_APP_BLIMP_NETWORK_DELEGATE_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "net/base/network_delegate_impl.h"
-
-namespace blimp {
-namespace engine {
-
-class BlimpNetworkDelegate : public net::NetworkDelegateImpl {
- public:
-  BlimpNetworkDelegate();
-  ~BlimpNetworkDelegate() override;
-
-  // Affects subsequent cookie retrieval and setting.
-  static void SetAcceptAllCookies(bool accept);
-
- private:
-  // net::NetworkDelegate implementation.
-  bool OnCanGetCookies(const net::URLRequest& request,
-                       const net::CookieList& cookie_list) override;
-  bool OnCanSetCookie(const net::URLRequest& request,
-                      const std::string& cookie_line,
-                      net::CookieOptions* options) override;
-
-  DISALLOW_COPY_AND_ASSIGN(BlimpNetworkDelegate);
-};
-
-}  // namespace engine
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_APP_BLIMP_NETWORK_DELEGATE_H_