Attempt scroll restoration anytime viewport size changes

Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 511 matching lines @@
 {
     return m_webView->client() ? m_webView->client()->screenInfo() : WebScreenInfo();
 }
 
 void ChromeClientImpl::contentsSizeChanged(LocalFrame* frame, const IntSize& size) const
 {
     m_webView->didChangeContentsSize();
 
     WebLocalFrameImpl* webframe = WebLocalFrameImpl::fromFrame(frame);
     webframe->didChangeContentsSize(size);
-
-    frame->loader().restoreScrollPositionAndViewState();
 }
 
 void ChromeClientImpl::pageScaleFactorChanged() const
 {
     m_webView->pageScaleFactorChanged();
 }
 
 float ChromeClientImpl::clampPageScaleFactorToLimits(float scale) const
 {
     return m_webView->clampPageScaleFactorToLimits(scale);
@@ skipping 432 matching lines @@
     for (const auto& observer : observers)
         observer->willOpenPopup();
 }
 
 FloatSize ChromeClientImpl::elasticOverscroll() const
 {
     return m_webView->elasticOverscroll();
 }
 
 } // namespace blink