fontSelector should be reset when removing stylesheets which has @font-face rule.

Source/core/dom/DocumentStyleSheetCollection.cpp

Index: Source/core/dom/DocumentStyleSheetCollection.cpp
diff --git a/Source/core/dom/DocumentStyleSheetCollection.cpp b/Source/core/dom/DocumentStyleSheetCollection.cpp
index 95d2c79cb2c7a7a657e51db889583fbaf088d254..179e847832a6a6afb958ab734ee52f41ae7f9c11 100644
--- a/Source/core/dom/DocumentStyleSheetCollection.cpp
+++ b/Source/core/dom/DocumentStyleSheetCollection.cpp
@@ -158,7 +158,8 @@ bool DocumentStyleSheetCollection::updateActiveStyleSheets(StyleEngine* collecti
 
     StyleResolverUpdateType styleResolverUpdateType;
     bool requiresFullStyleRecalc;
-    analyzeStyleSheetChange(updateMode, activeAuthorStyleSheets(), activeCSSStyleSheets, styleResolverUpdateType, requiresFullStyleRecalc);
+    bool requiresResetFontSelector;
+    analyzeStyleSheetChange(updateMode, activeAuthorStyleSheets(), activeCSSStyleSheets, styleResolverUpdateType, requiresFullStyleRecalc, requiresResetFontSelector);
 
     if (styleResolverUpdateType == Reconstruct) {
         document()->clearStyleResolver();
@@ -170,6 +171,8 @@ bool DocumentStyleSheetCollection::updateActiveStyleSheets(StyleEngine* collecti
         styleResolver->setBuildScopedStyleTreeInDocumentOrder(false);
         if (styleResolverUpdateType == Reset) {
             resetAllRuleSetsInTreeScope(styleResolver);
+            if (requiresResetFontSelector)
+                styleResolver->resetFontSelector();
             styleResolver->appendAuthorStyleSheets(0, activeCSSStyleSheets);
         } else {
             ASSERT(styleResolverUpdateType == Additive);