Only FontCache should know about system font substitution

Source/core/css/LocalFontFaceSource.cpp

Index: Source/core/css/LocalFontFaceSource.cpp
diff --git a/Source/core/css/LocalFontFaceSource.cpp b/Source/core/css/LocalFontFaceSource.cpp
index 9700d635557fdb9c47387a03070dbd57e8729ab3..a920bdfd0bce188afbbe6cbf427a2f9afaa5d95a 100644
--- a/Source/core/css/LocalFontFaceSource.cpp
+++ b/Source/core/css/LocalFontFaceSource.cpp
@@ -5,7 +5,6 @@
 #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"
@@ -15,13 +14,13 @@ 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();
 }