Avoid unnecessary copies of AccessibilityChildrenVector

Source/modules/accessibility/AXARIAGridCell.cpp

Index: Source/modules/accessibility/AXARIAGridCell.cpp
diff --git a/Source/modules/accessibility/AXARIAGridCell.cpp b/Source/modules/accessibility/AXARIAGridCell.cpp
index 8bb16c403d5bbaecf8d45a4d386f87899aaf0c7b..907e653b03ca6974697db6ca1e350ac540e15bcf 100644
--- a/Source/modules/accessibility/AXARIAGridCell.cpp
+++ b/Source/modules/accessibility/AXARIAGridCell.cpp
@@ -97,7 +97,7 @@ void AXARIAGridCell::rowIndexRange(pair<unsigned, unsigned>& rowRange)
         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) {
@@ -120,7 +120,7 @@ void AXARIAGridCell::columnIndexRange(pair<unsigned, unsigned>& columnRange)
     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) {