Use SkFontMgr for webfont construction on windows

Source/platform/fonts/FontCache.h

 /*
  * Copyright (C) 2006, 2008 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007-2008 Torch Mobile, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 79 matching lines @@
 
     unsigned short generation();
     void invalidate();
 
 #if OS(WIN)
     PassRefPtr<SimpleFontData> fontDataFromDescriptionAndLogFont(const FontDescription&, ShouldRetain, const LOGFONT&, wchar_t* outFontFamilyName);
 #endif
 
 #if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS)
     bool useSubpixelPositioning() const { return m_useSubpixelPositioning; }
+    SkFontMgr* fontManager() { return m_fontManager.get(); }
 #endif
 
 #if ENABLE(OPENTYPE_VERTICAL)
     typedef uint32_t FontFileKey;
     PassRefPtr<OpenTypeVerticalData> getVerticalData(const FontFileKey&, const FontPlatformData&);
 #endif
 
 #if OS(ANDROID)
     static AtomicString getGenericFamilyNameForScript(const AtomicString& familyName, UScriptCode);
 #else
@@ skipping 47 matching lines @@
 
 class PLATFORM_EXPORT FontCachePurgePreventer {
 public:
     FontCachePurgePreventer() { FontCache::fontCache()->disablePurging(); }
     ~FontCachePurgePreventer() { FontCache::fontCache()->enablePurging(); }
 };
 
 }
 
 #endif