Fixes for re-enabling more MSVC level 4 warnings: Source/core/ edition

Source/core/accessibility/AXObject.cpp

Index: Source/core/accessibility/AXObject.cpp
diff --git a/Source/core/accessibility/AXObject.cpp b/Source/core/accessibility/AXObject.cpp
index 08d9104b40042ab122302c3b75aed9ddd58578fb..a850124ac3fa3471bfd1d2c9bf36e85de56a89de 100644
--- a/Source/core/accessibility/AXObject.cpp
+++ b/Source/core/accessibility/AXObject.cpp
@@ -720,10 +720,13 @@ void AXObject::scrollToMakeVisibleWithSubFocus(const IntRect& subfocus) const
 {
     // Search up the parent chain until we find the first one that's scrollable.
     AXObject* scrollParent = parentObject();
-    ScrollableArea* scrollableArea;
-    for (scrollableArea = 0;
-        scrollParent && !(scrollableArea = scrollParent->getScrollableAreaIfScrollable());
-        scrollParent = scrollParent->parentObject()) { }
+    ScrollableArea* scrollableArea = 0;
+    while (scrollParent) {
+        scrollableArea = scrollParent->getScrollableAreaIfScrollable();
+        if (scrollableArea)
+            break;
+        scrollParent = scrollParent->parentObject();
+    }
     if (!scrollableArea)
         return;