Remove CRWWebControllerProvider

ios/public/provider/web/web_controller_provider_factory.mm

-// 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.
-
-#import "ios/public/provider/web/web_controller_provider_factory.h"
-
-#include "base/memory/ptr_util.h"
-#import "ios/public/provider/web/web_controller_provider.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace ios {
-namespace {
-WebControllerProviderFactory* g_web_controller_provider_factory;
-}
-
-WebControllerProviderFactory::WebControllerProviderFactory() {}
-
-WebControllerProviderFactory::~WebControllerProviderFactory() {}
-
-std::unique_ptr<WebControllerProvider>
-WebControllerProviderFactory::CreateWebControllerProvider(
-    web::BrowserState* browser_state) {
-  return base::MakeUnique<WebControllerProvider>(browser_state);
-}
-
-void SetWebControllerProviderFactory(
-    WebControllerProviderFactory* provider_factory) {
-  g_web_controller_provider_factory = provider_factory;
-}
-
-WebControllerProviderFactory* GetWebControllerProviderFactory() {
-  return g_web_controller_provider_factory;
-}
-
-}  // namespace ios