Use removeFontFace to avoid resetting fontSelector.

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 07a8160e095c7570549dd92d5debd885e0900c25..7e6accde767e20ee9af4c6f9f0d9d30f5d4dad9e 100644
--- a/Source/core/dom/DocumentStyleSheetCollection.cpp
+++ b/Source/core/dom/DocumentStyleSheetCollection.cpp
@@ -135,23 +135,22 @@ bool DocumentStyleSheetCollection::updateActiveStyleSheets(StyleEngine* engine,
 
     if (change.styleResolverUpdateType == Reconstruct) {
         engine->clearMasterResolver();
+        // FIMXE: The following depends on whether StyleRuleFontFace was modified or not.
+        // No need to always-reset.
         engine->resetFontSelector();
     } else if (StyleResolver* styleResolver = engine->resolver()) {
         // FIXME: We might have already had styles in child treescope. In this case, we cannot use buildScopedStyleTreeInDocumentOrder.
         // Need to change "false" to some valid condition.
         styleResolver->setBuildScopedStyleTreeInDocumentOrder(false);
         if (change.styleResolverUpdateType != Additive) {
-            ASSERT(change.styleResolverUpdateType == Reset || change.styleResolverUpdateType == ResetStyleResolverAndFontSelector);
+            ASSERT(change.styleResolverUpdateType == Reset);
             resetAllRuleSetsInTreeScope(styleResolver);
-            if (change.styleResolverUpdateType == ResetStyleResolverAndFontSelector)
-                engine->resetFontSelector();
+            engine->removeFontFaceRules(change.fontFaceRulesToRemove);
             styleResolver->removePendingAuthorStyleSheets(m_activeAuthorStyleSheets);
             styleResolver->lazyAppendAuthorStyleSheets(0, collector.collection().activeAuthorStyleSheets());
         } else {
             styleResolver->lazyAppendAuthorStyleSheets(m_activeAuthorStyleSheets.size(), collector.collection().activeAuthorStyleSheets());
         }
-    } else if (change.styleResolverUpdateType == ResetStyleResolverAndFontSelector) {
-        engine->resetFontSelector();
     }
     m_scopingNodesForStyleScoped.didRemoveScopingNodes();
     collector.setCollectionTo(*this);