Remove the Vector::append overload that takes a Vector

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 8f329f86d8b09868db9d3542e761387d3aa7062d..309e19e22c90954853506453a106806dbae1ba4a 100644
--- a/Source/core/dom/StyleEngine.cpp
+++ b/Source/core/dom/StyleEngine.cpp
@@ -408,13 +408,13 @@ const Vector<RefPtr<StyleSheet> > StyleEngine::activeStyleSheetsForInspector() c
 
     Vector<RefPtr<StyleSheet> > activeStyleSheets;
 
-    activeStyleSheets.append(m_documentStyleSheetCollection.styleSheetsForStyleSheetList());
+    activeStyleSheets.appendVector(m_documentStyleSheetCollection.styleSheetsForStyleSheetList());
 
     TreeScopeSet::const_iterator begin = m_activeTreeScopes.begin();
     TreeScopeSet::const_iterator end = m_activeTreeScopes.end();
     for (TreeScopeSet::const_iterator it = begin; it != end; ++it) {
         if (TreeScopeStyleSheetCollection* collection = m_styleSheetCollectionMap.get(*it))
-            activeStyleSheets.append(collection->styleSheetsForStyleSheetList());
+            activeStyleSheets.appendVector(collection->styleSheetsForStyleSheetList());
     }
 
     // FIXME: Inspector needs a vector which has all active stylesheets.