Remove virtualized isRoot/isChild from HTMLImport.

Source/core/html/imports/HTMLImport.h

Index: Source/core/html/imports/HTMLImport.h
diff --git a/Source/core/html/imports/HTMLImport.h b/Source/core/html/imports/HTMLImport.h
index 488940f8ff0e986a75059397eaa9552dadee485c..46f3e4ac9242920bc7ce4c6e21bc80a357d2bb5f 100644
--- a/Source/core/html/imports/HTMLImport.h
+++ b/Source/core/html/imports/HTMLImport.h
@@ -106,14 +106,13 @@ public:
     // FIXME: Consider returning HTMLImportTreeRoot.
     HTMLImport* root();
     bool precedes(HTMLImport*);
-    bool isRoot() const { return !isChild(); }
+    bool isRoot() const { return !parent(); }
     bool isSync() const { return SyncMode(m_sync) == Sync; }
     bool formsCycle() const;
     const HTMLImportState& state() const { return m_state; }
 
     void appendImport(HTMLImport*);
 
-    virtual bool isChild() const { return false; }
     virtual Document* document() const = 0;
     virtual bool isDone() const = 0; // FIXME: Should be renamed to haveFinishedLoading()
     virtual HTMLImportLoader* loader() const { return 0; }