Initialise raw pointer to null in FontBuilder constructor

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 45 matching lines @@
 
 private:
     FontBuilder* m_fontBuilder;
     FontDescription m_fontDescription;
 };
 
 FontBuilder::FontBuilder()
     : 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());
@@ skipping 599 matching lines @@
     FontOrientation fontOrientation;
     NonCJKGlyphOrientation glyphOrientation;
     getFontAndGlyphOrientation(documentStyle, fontOrientation, glyphOrientation);
     fontDescription.setOrientation(fontOrientation);
     fontDescription.setNonCJKGlyphOrientation(glyphOrientation);
     documentStyle->setFontDescription(fontDescription);
     documentStyle->font().update(fontSelector);
 }
 
 }