Adding WebFallbackFont and renaming SimpleFontFamily

Source/platform/fonts/Font.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2010, 2011 Apple 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 493 matching lines @@
     // System fallback is character-dependent. When we get here, we
     // know that the character in question isn't in the system fallback
     // font's glyph page. Try to lazily create it here.
 
     // FIXME: Unclear if this should normalizeSpaces above 0xFFFF.
     // Doing so changes fast/text/international/plane2-diffs.html
     UChar32 characterToRender = c;
     if (characterToRender <=  0xFFFF)
         characterToRender = Character::normalizeSpaces(characterToRender);
     const SimpleFontData* fontDataToSubstitute = fontDataAt(0)->fontDataForCharacter(characterToRender);
-    RefPtr<SimpleFontData> characterFontData = FontCache::fontCache()->platformFallbackForCharacter(m_fontDescription, characterToRender, fontDataToSubstitute);
+    RefPtr<SimpleFontData> characterFontData = FontCache::fontCache()->fallbackFontForCharacter(m_fontDescription, characterToRender, fontDataToSubstitute);
     if (characterFontData) {
         if (characterFontData->platformData().orientation() == Vertical && !characterFontData->hasVerticalGlyphs() && Character::isCJKIdeographOrSymbol(c))
             variant = BrokenIdeographVariant;
         if (variant != NormalVariant)
             characterFontData = characterFontData->variantFontData(m_fontDescription, variant);
     }
     if (characterFontData) {
         // Got the fallback glyph and font.
         GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData.get(), pageNumber)->page();
         GlyphData data = fallbackPage && fallbackPage->glyphForCharacter(c) ? fallbackPage->glyphDataForCharacter(c) : characterFontData->missingGlyphData();
@@ skipping 326 matching lines @@
                 if (delta <= 0)
                     break;
             }
         }
     }
 
     return offset;
 }
 
 }