Use removeFontFace to avoid resetting fontSelector.

Source/core/dom/StyleEngine.cpp

Index: Source/core/dom/StyleEngine.cpp
diff --git a/Source/core/dom/StyleEngine.cpp b/Source/core/dom/StyleEngine.cpp
index 48d06dd193fe9eb069ce282c67915eb11d683441..84afe041493ae368e54ce1855845c30868871532 100644
--- a/Source/core/dom/StyleEngine.cpp
+++ b/Source/core/dom/StyleEngine.cpp
@@ -572,6 +572,16 @@ void StyleEngine::resetFontSelector()
     }
 }
 
+void StyleEngine::removeFontFaceRules(const Vector<const StyleRuleFontFace*>& fontFaceRules)
+{
+    if (!m_fontSelector)
+        return;
+    for (unsigned i = 0; i < fontFaceRules.size(); ++i)
+        m_fontSelector->removeFontFaceRule(fontFaceRules[i]);
+    if (m_resolver)
+        m_resolver->invalidateMatchedPropertiesCache();
+}
+
 void StyleEngine::markTreeScopeDirty(TreeScope& scope)
 {
     if (scope == m_document) {