Remove all blimp engine code

blimp/engine/feature/engine_settings_feature.cc

-// 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.
-
-#include "blimp/engine/feature/engine_settings_feature.h"
-
-#include "blimp/common/proto/blimp_message.pb.h"
-#include "blimp/common/proto/settings.pb.h"
-#include "blimp/engine/app/settings_manager.h"
-#include "blimp/engine/common/blimp_content_client.h"
-#include "content/public/browser/render_view_host.h"
-#include "content/public/common/web_preferences.h"
-#include "net/base/net_errors.h"
-
-namespace blimp {
-namespace engine {
-
-EngineSettingsFeature::EngineSettingsFeature(SettingsManager* settings_manager)
-    : settings_manager_(settings_manager) {
-  DCHECK(settings_manager_);
-}
-
-EngineSettingsFeature::~EngineSettingsFeature() {}
-
-void EngineSettingsFeature::ProcessMessage(
-    std::unique_ptr<BlimpMessage> message,
-    const net::CompletionCallback& callback) {
-  DCHECK_EQ(BlimpMessage::kSettings, message->feature_case());
-
-  const SettingsMessage& settings = message->settings();
-  DCHECK(settings.has_engine_settings());
-
-  const EngineSettingsMessage& engine_settings = settings.engine_settings();
-  ProcessSettings(engine_settings);
-
-  callback.Run(net::OK);
-}
-
-void EngineSettingsFeature::ProcessSettings(
-    const EngineSettingsMessage& engine_settings) {
-  if (engine_settings.has_record_whole_document()) {
-    EngineSettings settings = settings_manager_->GetEngineSettings();
-    settings.record_whole_document = engine_settings.record_whole_document();
-    settings_manager_->UpdateEngineSettings(settings);
-  }
-
-  // Set the client OS information for building user agent.
-  if (engine_settings.has_client_os_info()) {
-    std::string client_os_info = engine_settings.client_os_info();
-    SetClientOSInfo(client_os_info);
-  }
-}
-
-}  // namespace engine
-}  // namespace blimp