Oilpan: move Range object to the oilpan heap.

Source/core/accessibility/AXRenderObject.cpp

Index: Source/core/accessibility/AXRenderObject.cpp
diff --git a/Source/core/accessibility/AXRenderObject.cpp b/Source/core/accessibility/AXRenderObject.cpp
index be09e6ae0217b9b7aeb4adc814e2e29892c9c314..a1e61f98bc59314ffd2c64ff5215ab7bfbdcd871 100644
--- a/Source/core/accessibility/AXRenderObject.cpp
+++ b/Source/core/accessibility/AXRenderObject.cpp
@@ -1742,7 +1742,7 @@ VisiblePosition AXRenderObject::visiblePositionForIndex(int index) const
     if (index <= 0)
         return VisiblePosition(firstPositionInOrBeforeNode(node), DOWNSTREAM);
 
-    RefPtr<Range> range = Range::create(m_renderer->document());
+    RefPtrWillBeRawPtr<Range> range = Range::create(m_renderer->document());
     range->selectNodeContents(node, IGNORE_EXCEPTION);
     CharacterIterator it(range.get());
     it.advance(index - 1);
@@ -1768,7 +1768,7 @@ int AXRenderObject::indexForVisiblePosition(const VisiblePosition& pos) const
     if (indexPosition.isNull() || highestEditableRoot(indexPosition, HasEditableAXRole) != node)
         return 0;
 
-    RefPtr<Range> range = Range::create(m_renderer->document());
+    RefPtrWillBeRawPtr<Range> range = Range::create(m_renderer->document());
     range->setStart(node, 0, IGNORE_EXCEPTION);
     range->setEnd(indexPosition, IGNORE_EXCEPTION);
 
@@ -1863,7 +1863,7 @@ AXObject::PlainTextRange AXRenderObject::ariaSelectedTextRange() const
         return PlainTextRange();
 
     VisibleSelection visibleSelection = selection();
-    RefPtr<Range> currentSelectionRange = visibleSelection.toNormalizedRange();
+    RefPtrWillBeRawPtr<Range> currentSelectionRange = visibleSelection.toNormalizedRange();
     if (!currentSelectionRange || !currentSelectionRange->intersectsNode(node, IGNORE_EXCEPTION))
         return PlainTextRange();