Should update FontFaceCache version when updating generic font-family settings.

Source/core/css/CSSFontSelector.cpp

Index: Source/core/css/CSSFontSelector.cpp
diff --git a/Source/core/css/CSSFontSelector.cpp b/Source/core/css/CSSFontSelector.cpp
index bff39895048036117507d8d77cecb80f9873a3bb..83306aa55fd9e0282385c80886d4a9336505fb56 100644
--- a/Source/core/css/CSSFontSelector.cpp
+++ b/Source/core/css/CSSFontSelector.cpp
@@ -170,6 +170,8 @@ void CSSFontSelector::updateGenericFontFamilySettings(Document& document)
     if (!document.settings())
         return;
     m_genericFontFamilySettings = document.settings()->genericFontFamilySettings();
+    // Need to increment FontFaceCache version to update RenderStyles.
+    m_fontFaceCache.incrementVersion();
 }
 
 void CSSFontSelector::trace(Visitor* visitor)