Replace some trivial WebKitSystemInterface wrappers with direct calls to SPI.

Source/core/platform/graphics/mac/GlyphPageTreeNodeMac.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  *
  * 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. 
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
  */
 
 #include "config.h"
 #include "core/platform/graphics/GlyphPageTreeNode.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #include "core/platform/graphics/Font.h"
 #include "core/platform/graphics/SimpleFontData.h"
 #include "core/platform/mac/WebCoreSystemInterface.h"
 
+// Forward declare Mac SPIs.
+// Request for public API: rdar://13787589
+extern "C" {
+void CGFontGetGlyphsForUnichars(CGFontRef font, const UniChar chars[], CGGlyph glyphs[], size_t length);
+}
+
 namespace WebCore {
 
 static bool shouldUseCoreText(UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData)
 {
     if (fontData->platformData().isCompositeFontReference())
         return true;
     if (fontData->platformData().widthVariant() != RegularWidth || fontData->hasVerticalGlyphs()) {
         // Ideographs don't have a vertical variant or width variants.
         for (unsigned i = 0; i < bufferLength; ++i) {
             if (!Font::isCJKIdeograph(buffer[i]))
                 return true;
         }
     }
 
     return false;
 }
 
 bool GlyphPage::fill(unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData)
 {
     bool haveGlyphs = false;
 
     Vector<CGGlyph, 512> glyphs(bufferLength);
     if (!shouldUseCoreText(buffer, bufferLength, fontData)) {
-        WKGetGlyphsForCharacters(fontData->platformData().cgFont(), buffer, glyphs.data(), bufferLength);
+        CGFontGetGlyphsForUnichars(fontData->platformData().cgFont(), buffer, glyphs.data(), bufferLength);
         for (unsigned i = 0; i < length; ++i) {
             if (!glyphs[i])
                 setGlyphDataForIndex(offset + i, 0, 0);
             else {
                 setGlyphDataForIndex(offset + i, glyphs[i], fontData);
                 haveGlyphs = true;
             }
         }
     } else if (!fontData->platformData().isCompositeFontReference() && ((fontData->platformData().widthVariant() == RegularWidth) ? WKGetVerticalGlyphsForCharacters(fontData->platformData().ctFont(), buffer, glyphs.data(), bufferLength)
                : CTFontGetGlyphsForCharacters(fontData->platformData().ctFont(), buffer, glyphs.data(), bufferLength))) {
@@ skipping 83 matching lines @@
                     }
                 }
             }
         }
     }
 
     return haveGlyphs;
 }
 
 } // namespace WebCore