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

Source/core/accessibility/AccessibilityARIAGridCell.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 63 matching lines @@
     AccessibilityObject* parent = parentObjectUnignored();
     if (!parent)
         return;
 
     if (parent->isTableRow()) {
         // We already got a table row, use its API.
         rowRange.first = static_cast<AccessibilityTableRow*>(parent)->rowIndex();
     } else if (parent->isAccessibilityTable()) {
         // We reached the parent table, so we need to inspect its
         // children to determine the row index for the cell in it.
-        unsigned columnCount = static_cast<AccessibilityTable*>(parent)->columnCount();
+        unsigned columnCount = toAccessibilityTable(parent)->columnCount();
         if (!columnCount)
             return;
 
         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;
             }
@@ skipping 20 matching lines @@
             columnRange.first = k;
             break;
         }
     }
 
     // as far as I can tell, grid cells cannot span columns
     columnRange.second = 1;
 }
 
 } // namespace WebCore