Remove all blimp engine code

blimp/engine/app/engine_settings.h

-// Copyright 2016 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_ENGINE_SETTINGS_H_
-#define BLIMP_ENGINE_APP_ENGINE_SETTINGS_H_
-
-#include "content/public/common/web_preferences.h"
-
-namespace blimp {
-namespace engine {
-
-// The EngineSettings includes all parameters which are configured for the
-// BlimpEngine and can be set by the client. This includes the values for
-// content::WebPreferences which override the default values.
-struct EngineSettings {
-  EngineSettings() {}
-
-  // -------WebPreferences-------
-  // These members mirror the parameters in content::WebPreferences. See
-  // content/public/common/web_preferences.h for details.
-
-  bool record_whole_document = false;
-
-  // Disable animation in images by default.
-  content::ImageAnimationPolicy animation_policy =
-      content::ImageAnimationPolicy::IMAGE_ANIMATION_POLICY_NO_ANIMATION;
-
-  bool viewport_meta_enabled = true;
-  bool shrinks_viewport_contents_to_fit = true;
-  float default_minimum_page_scale_factor = 0.25f;
-  float default_maximum_page_scale_factor = 5.f;
-};
-
-}  // namespace engine
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_APP_ENGINE_SETTINGS_H_