Remove the Vector::append overload that takes a Vector

Source/core/accessibility/AXTable.cpp

Index: Source/core/accessibility/AXTable.cpp
diff --git a/Source/core/accessibility/AXTable.cpp b/Source/core/accessibility/AXTable.cpp
index bccdc18dd81fa352b490913580400fc85f4cf7df..5f385a2151221a13fb6ee2a2b36ebe1731d64589 100644
--- a/Source/core/accessibility/AXTable.cpp
+++ b/Source/core/accessibility/AXTable.cpp
@@ -439,7 +439,7 @@ void AXTable::cells(AXObject::AccessibilityChildrenVector& cells)
     int numRows = m_rows.size();
     for (int row = 0; row < numRows; ++row) {
         AccessibilityChildrenVector rowChildren = m_rows[row]->children();
-        cells.append(rowChildren);
+        cells.appendVector(rowChildren);
     }
 }