code clean-up, issue crbug.com/260966 is fixed with

Source/core/css/resolver/FontBuilder.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * 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.
  *
@@ skipping 52 matching lines @@
     : m_document(0)
     , m_useSVGZoomRules(false)
     , m_fontSizehasViewportUnits(false)
     , m_style(0)
     , m_fontDirty(false)
 {
 }
 
 void FontBuilder::initForStyleResolve(const Document& document, RenderStyle* style, bool useSVGZoomRules)
 {
-    // All documents need to be in a frame (and thus have access to Settings)
-    // for style-resolution to make sense.
-    // Unfortunately SVG Animations currently violate this: crbug.com/260966
-    // ASSERT(m_document->frame());
+    ASSERT(document.frame());
     m_document = &document;
     m_useSVGZoomRules = useSVGZoomRules;
     m_style = style;
     m_fontDirty = false;
 }
 
 inline static void setFontFamilyToStandard(FontDescription& fontDescription, const Document* document)
 {
     if (!document || !document->settings())
         return;
@@ skipping 582 matching lines @@
     FontOrientation fontOrientation;
     NonCJKGlyphOrientation glyphOrientation;
     getFontAndGlyphOrientation(documentStyle, fontOrientation, glyphOrientation);
     fontDescription.setOrientation(fontOrientation);
     fontDescription.setNonCJKGlyphOrientation(glyphOrientation);
     documentStyle->setFontDescription(fontDescription);
     documentStyle->font().update(fontSelector);
 }
 
 }