Carry out a resize even if no layout has been performed.

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 442 matching lines @@
     m_multisamplingChangedObservers.remove(observer);
 }
 
 void Page::settingsChanged(SettingsDelegate::ChangeType changeType)
 {
     switch (changeType) {
     case SettingsDelegate::StyleChange:
         setNeedsRecalcStyleInAllFrames();
         break;
     case SettingsDelegate::ViewportDescriptionChange:
-        if (mainFrame() && mainFrame()->isLocalFrame())
+        if (mainFrame() && mainFrame()->isLocalFrame()) {
             deprecatedLocalMainFrame()->document()->updateViewportDescription();
+            deprecatedLocalMainFrame()->view()->didChangeForceLayoutHeightMode();
+        }
         break;
     case SettingsDelegate::MediaTypeChange:
         if (m_mainFrame->isLocalFrame()) {
             deprecatedLocalMainFrame()->view()->setMediaType(AtomicString(settings().mediaTypeOverride()));
             setNeedsRecalcStyleInAllFrames();
         }
         break;
     case SettingsDelegate::DNSPrefetchingChange:
         for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext()) {
             if (frame->isLocalFrame())
@@ skipping 155 matching lines @@
     , inspectorClient(nullptr)
     , spellCheckerClient(nullptr)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace blink