Avoid unnecessary copies of AccessibilityChildrenVector

Source/modules/accessibility/AXARIAGridCell.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 79 matching lines @@
     if (parent->isTableRow()) {
         // We already got a table row, use its API.
         rowRange.first = toAXTableRow(parent)->rowIndex();
     } else if (parent->isAXTable()) {
         // We reached the parent table, so we need to inspect its
         // children to determine the row index for the cell in it.
         unsigned columnCount = toAXTable(parent)->columnCount();
         if (!columnCount)
             return;
 
-        AccessibilityChildrenVector siblings = parent->children();
+        const AccessibilityChildrenVector& siblings = parent->children();
         unsigned childrenSize = siblings.size();
         for (unsigned k = 0; k < childrenSize; ++k) {
             if (siblings[k].get() == this) {
                 rowRange.first = k / columnCount;
                 break;
             }
         }
     }
 
     // as far as I can tell, grid cells cannot span rows
     rowRange.second = 1;
 }
 
 void AXARIAGridCell::columnIndexRange(pair<unsigned, unsigned>& columnRange)
 {
     AXObject* parent = parentObjectUnignored();
     if (!parent)
         return;
 
     if (!parent->isTableRow() && !parent->isAXTable())
         return;
 
-    AccessibilityChildrenVector siblings = parent->children();
+    const AccessibilityChildrenVector& siblings = parent->children();
     unsigned childrenSize = siblings.size();
     for (unsigned k = 0; k < childrenSize; ++k) {
         if (siblings[k].get() == this) {
             columnRange.first = k;
             break;
         }
     }
 
     // as far as I can tell, grid cells cannot span columns
     columnRange.second = 1;
 }
 
 AccessibilityRole AXARIAGridCell::scanToDecideHeaderRole()
 {
     if (isAriaRowHeader())
         return RowHeaderRole;
 
     if (isAriaColumnHeader())
         return ColumnHeaderRole;
 
     return CellRole;
 }
 
 } // namespace blink