Use removeFontFace to avoid resetting fontSelector.

Source/core/css/StyleSheetContents.h

Index: Source/core/css/StyleSheetContents.h
diff --git a/Source/core/css/StyleSheetContents.h b/Source/core/css/StyleSheetContents.h
index 1fed4021f57406c04aac978ab2182f64bde96d2c..7bc9cf0dbbaf81d71a0bdd1f00f0aec72d188176 100644
--- a/Source/core/css/StyleSheetContents.h
+++ b/Source/core/css/StyleSheetContents.h
@@ -41,6 +41,7 @@ class Document;
 class Node;
 class SecurityOrigin;
 class StyleRuleBase;
+class StyleRuleFontFace;
 class StyleRuleImport;
 
 class StyleSheetContents : public RefCounted<StyleSheetContents> {
@@ -93,6 +94,7 @@ public:
 
     void setHasFontFaceRule(bool b) { m_hasFontFaceRule = b; }
     bool hasFontFaceRule() const { return m_hasFontFaceRule; }
+    void extractFontFaceRule(Vector<const StyleRuleFontFace*>& fontFaceRules);
 
     void parserAddNamespace(const AtomicString& prefix, const AtomicString& uri);
     void parserAppendRule(PassRefPtr<StyleRuleBase>);