Remove CWV class and move setting User Agent to CWVWebViewConfiguration.

ios/web_view/internal/web_view_web_main_parts.mm

 // Copyright 2014 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.
 
 #import "ios/web_view/internal/web_view_web_main_parts.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/base_paths.h"
 #include "base/memory/ptr_util.h"
 #include "base/path_service.h"
-#include "components/translate/core/browser/translate_download_manager.h"
-#include "ios/web_view/internal/web_view_browser_state.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/base/resource/resource_bundle.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace ios_web_view {
 
 WebViewWebMainParts::WebViewWebMainParts() {}
 
 WebViewWebMainParts::~WebViewWebMainParts() = default;
 
 void WebViewWebMainParts::PreMainMessageLoopRun() {
   // Initialize resources.
   l10n_util::OverrideLocaleWithCocoaLocale();
   ui::ResourceBundle::InitSharedInstanceWithLocale(
       std::string(), nullptr, ui::ResourceBundle::DO_NOT_LOAD_COMMON_RESOURCES);
   base::FilePath pak_file;
   PathService::Get(base::DIR_MODULE, &pak_file);
   pak_file = pak_file.Append(FILE_PATH_LITERAL("web_view_resources.pak"));
   ui::ResourceBundle::GetSharedInstance().AddDataPackFromPath(
       pak_file, ui::SCALE_FACTOR_NONE);
-
-  browser_state_ = base::MakeUnique<WebViewBrowserState>(false);
-  off_the_record_browser_state_ = base::MakeUnique<WebViewBrowserState>(true);
-
-  // Initialize translate.
-  translate::TranslateDownloadManager* download_manager =
-      translate::TranslateDownloadManager::GetInstance();
-  // TODO(crbug.com/679895): See if we need the system request context here.
-  download_manager->set_request_context(browser_state_->GetRequestContext());
-  // TODO(crbug.com/679895): Bring up application locale correctly.
-  download_manager->set_application_locale(l10n_util::GetLocaleOverride());
-  download_manager->language_list()->SetResourceRequestsAllowed(true);
 }
 
 }  // namespace ios_web_view