Oilpan: move editing objects to the heap.

Source/core/editing/UndoStack.cpp

Index: Source/core/editing/UndoStack.cpp
diff --git a/Source/core/editing/UndoStack.cpp b/Source/core/editing/UndoStack.cpp
index 1ffd4273e98587e652a99fd26b6cc4afcb380c04..24847571961fff97cdebf2f36a13671eb27b72a9 100644
--- a/Source/core/editing/UndoStack.cpp
+++ b/Source/core/editing/UndoStack.cpp
@@ -53,7 +53,7 @@ PassOwnPtr<UndoStack> UndoStack::create()
     return adoptPtr(new UndoStack());
 }
 
-void UndoStack::registerUndoStep(PassRefPtr<UndoStep> step)
+void UndoStack::registerUndoStep(PassRefPtrWillBeRawPtr<UndoStep> step)
 {
     if (m_undoStack.size() == maximumUndoStackDepth)
         m_undoStack.removeFirst(); // drop oldest item off the far end
@@ -62,7 +62,7 @@ void UndoStack::registerUndoStep(PassRefPtr<UndoStep> step)
     m_undoStack.append(step);
 }
 
-void UndoStack::registerRedoStep(PassRefPtr<UndoStep> step)
+void UndoStack::registerRedoStep(PassRefPtrWillBeRawPtr<UndoStep> step)
 {
     m_redoStack.append(step);
 }
@@ -100,7 +100,7 @@ void UndoStack::undo()
 {
     if (canUndo()) {
         UndoStepStack::iterator back = --m_undoStack.end();
-        RefPtr<UndoStep> step(*back);
+        RefPtrWillBeRawPtr<UndoStep> step(back->get());
         m_undoStack.remove(back);
         step->unapply();
         // unapply will call us back to push this command onto the redo stack.
@@ -111,7 +111,7 @@ void UndoStack::redo()
 {
     if (canRedo()) {
         UndoStepStack::iterator back = --m_redoStack.end();
-        RefPtr<UndoStep> step(*back);
+        RefPtrWillBeRawPtr<UndoStep> step(back->get());
         m_redoStack.remove(back);
 
         ASSERT(!m_inRedo);