Removing GetWebViewFactory method in WebClient.

ios/web/public/web_client.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.
 
 #include "ios/web/public/web_client.h"
 
 #include <Foundation/Foundation.h>
 
 namespace web {
 
@@ skipping 10 matching lines @@
 WebClient::WebClient() {
 }
 
 WebClient::~WebClient() {
 }
 
 WebMainParts* WebClient::CreateWebMainParts() {
   return nullptr;
 }
 
-WebViewFactory* WebClient::GetWebViewFactory() const {
-  return nullptr;
-}
-
 std::string WebClient::GetAcceptLangs(BrowserState* state) const {
   return std::string();
 }
 
 std::string WebClient::GetApplicationLocale() const {
   return "en-US";
 }
 
 bool WebClient::IsAppSpecificURL(const GURL& url) const {
   return false;
@@ skipping 27 matching lines @@
 }
 
 NSString* WebClient::GetEarlyPageScript(WebViewType web_view_type) const {
   return @"";
 }
 
 bool WebClient::IsExternalURLBlockingEnabled() const {
   return true;
 }
 }  // namespace web