Use removeFontFace to avoid resetting fontSelector.

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 504 matching lines @@
         break;
     case SettingsDelegate::TextAutosizingChange:
         // FIXME: I wonder if this needs to traverse frames like in WebViewImpl::resize, or whether there is only one document per Settings instance?
         for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext()) {
             TextAutosizer* textAutosizer = frame->document()->textAutosizer();
             if (textAutosizer)
                 textAutosizer->recalculateMultipliers();
         }
         setNeedsRecalcStyleInAllFrames();
         break;
+    case SettingsDelegate::FontFamilyChange:
+        for (Frame* frame = mainFrame(); frame; frame = frame->tree().traverseNext())
+            frame->document()->styleEngine()->resetFontSelector();
+        break;
     }
 }
 
 void Page::didCommitLoad(Frame* frame)
 {
     lifecycleNotifier().notifyDidCommitLoad(frame);
     if (m_mainFrame == frame)
         useCounter().didCommitLoad();
 }
 
@@ skipping 16 matching lines @@
     , backForwardClient(0)
     , spellCheckerClient(0)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace WebCore