Made WebFactory::SetInstance private

third_party/WebKit/Source/web/WebFactoryImpl.h

 // Copyright 2017 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 WebFactoryImpl_h
 #define WebFactoryImpl_h
 
 #include "core/exported/WebFactory.h"
 
 namespace blink {
 
 class WebFactoryImpl : public WebFactory {
  public:
   WebFactoryImpl() {}
   ~WebFactoryImpl() {}
 
+  // Sets WebFactory to have a new instance of WebFactoryImpl.
+  static void Initialize();
+
   ChromeClient* CreateChromeClient(WebViewBase*) const override;
   WebViewBase* CreateWebViewBase(WebViewClient*,
                                  WebPageVisibilityState) const override;
 };
 
 }  // namespace blink
 
 #endif