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 7d59d80ef931d31520000ce0e599967a1dd9ae01..9556e26ed95e3a4ad7a054121993622d6d6b5f1d 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 findFontFaceRules(Vector<const StyleRuleFontFace*>& fontFaceRules);
 
     void parserAddNamespace(const AtomicString& prefix, const AtomicString& uri);
     void parserAppendRule(PassRefPtr<StyleRuleBase>);
@@ -153,6 +155,7 @@ public:
 private:
     StyleSheetContents(StyleRuleImport* ownerRule, const String& originalURL, const CSSParserContext&);
     StyleSheetContents(const StyleSheetContents&);
+    void notifyRemoveFontFaceRule(const StyleRuleFontFace*);
 
     void clearCharsetRule();