Oilpan: move editing objects to the heap.

Source/core/editing/Caret.cpp

Index: Source/core/editing/Caret.cpp
diff --git a/Source/core/editing/Caret.cpp b/Source/core/editing/Caret.cpp
index 2b3c1d6ccf2ebb25d5d785e3293dcadc09b02066..c8cbb2ed0d03abc5e70eab4906e9c8577af76886 100644
--- a/Source/core/editing/Caret.cpp
+++ b/Source/core/editing/Caret.cpp
@@ -46,9 +46,9 @@ DragCaretController::DragCaretController()
 {
 }
 
-PassOwnPtr<DragCaretController> DragCaretController::create()
+PassOwnPtrWillBeRawPtr<DragCaretController> DragCaretController::create()
 {
-    return adoptPtr(new DragCaretController);
+    return adoptPtrWillBeNoop(new DragCaretController);
 }
 
 bool DragCaretController::isContentRichlyEditable() const
@@ -100,6 +100,11 @@ void DragCaretController::nodeWillBeRemoved(Node& node)
     clear();
 }
 
+void DragCaretController::trace(Visitor* visitor)
+{
+    visitor->trace(m_position);
+}
+
 void CaretBase::clearCaretRect()
 {
     m_caretLocalRect = LayoutRect();