Cleanup: Start using toFoo methods as part of newly adopted coding guideline.

Source/core/accessibility/AccessibilityARIAGridRow.cpp

Index: Source/core/accessibility/AccessibilityARIAGridRow.cpp
diff --git a/Source/core/accessibility/AccessibilityARIAGridRow.cpp b/Source/core/accessibility/AccessibilityARIAGridRow.cpp
index a9f14c8a2ce336ccf4d565f939036cfa379bf4d7..a7ddd2682b165ad4cf3f770948b35c36c030efdf 100644
--- a/Source/core/accessibility/AccessibilityARIAGridRow.cpp
+++ b/Source/core/accessibility/AccessibilityARIAGridRow.cpp
@@ -73,7 +73,7 @@ void AccessibilityARIAGridRow::disclosedRows(AccessibilityChildrenVector& disclo
         return;
 
     unsigned level = hierarchicalLevel();
-    AccessibilityChildrenVector& allRows = static_cast<AccessibilityTable*>(parent)->rows();
+    AccessibilityChildrenVector& allRows = toAccessibilityTable(parent)->rows();
     int rowCount = allRows.size();
     for (int k = index + 1; k < rowCount; ++k) {
         AccessibilityObject* row = allRows[k].get();
@@ -100,7 +100,7 @@ AccessibilityObject* AccessibilityARIAGridRow::disclosedByRow() const
 
     // Search for the previous row that matches the correct level.
     int index = rowIndex();
-    AccessibilityChildrenVector& allRows = static_cast<AccessibilityTable*>(parent)->rows();
+    AccessibilityChildrenVector& allRows = toAccessibilityTable(parent)->rows();
     int rowCount = allRows.size();
     if (index >= rowCount)
         return 0;