Don't return false for RenderStyle::operator== while fonts load.

Source/core/rendering/style/RenderStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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 490 matching lines @@
         if (!rareInheritedData->shadowDataEquivalent(*other.rareInheritedData.get()))
             return true;
 
         if (!rareInheritedData->quotesDataEquivalent(*other.rareInheritedData.get()))
             return true;
     }
 
     if (inherited->textAutosizingMultiplier != other.inherited->textAutosizingMultiplier)
         return true;
 
+    if (inherited->font.loadingCustomFonts() != other.inherited->font.loadingCustomFonts())
+        return true;
+
     if (inherited.get() != other.inherited.get()) {
         if (inherited->line_height != other.inherited->line_height
             || inherited->font != other.inherited->font
             || inherited->horizontal_border_spacing != other.inherited->horizontal_border_spacing
             || inherited->vertical_border_spacing != other.inherited->vertical_border_spacing)
             return true;
     }
 
     if (inherited_flags._box_direction != other.inherited_flags._box_direction
         || inherited_flags.m_rtlOrdering != other.inherited_flags.m_rtlOrdering
@@ skipping 1138 matching lines @@
         horizontal || includeLogicalRightEdge);
 
     edges[BSLeft] = BorderEdge(borderLeftWidth(),
         visitedDependentColor(CSSPropertyBorderLeftColor),
         borderLeftStyle(),
         borderLeftIsTransparent(),
         !horizontal || includeLogicalLeftEdge);
 }
 
 } // namespace blink