Only FontCache should know about system font substitution

Source/core/css/LocalFontFaceSource.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/LocalFontFaceSource.h"
 
-#include "platform/fonts/AlternateFontFamily.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "public/platform/Platform.h"
 
 namespace WebCore {
 
 bool LocalFontFaceSource::isLocalFontAvailable(const FontDescription& fontDescription)
 {
-    return FontCache::fontCache()->isPlatformFontAvailable(fontDescription, adjustFamilyNameToAvoidUnsupportedFonts(m_fontName));
+    return FontCache::fontCache()->isPlatformFontAvailable(fontDescription, m_fontName);
 }
 
 PassRefPtr<SimpleFontData> LocalFontFaceSource::createFontData(const FontDescription& fontDescription)
 {
     // We don't want to check alternate font family names here, so pass true as the checkingAlternateName parameter.
-    RefPtr<SimpleFontData> fontData = FontCache::fontCache()->getFontData(fontDescription, adjustFamilyNameToAvoidUnsupportedFonts(m_fontName), true);
+    RefPtr<SimpleFontData> fontData = FontCache::fontCache()->getFontData(fontDescription, m_fontName, true);
     m_histograms.record(fontData);
     return fontData.release();
 }
 
 void LocalFontFaceSource::LocalFontHistograms::record(bool loadSuccess)
 {
     if (m_reported)
         return;
     m_reported = true;
     blink::Platform::current()->histogramEnumeration("WebFont.LocalFontUsed", loadSuccess ? 1 : 0, 2);
 }
 
 } // namespace WebCore