Oilpan: move editing objects to the heap.

Source/core/editing/InsertLineBreakCommand.cpp

Index: Source/core/editing/InsertLineBreakCommand.cpp
diff --git a/Source/core/editing/InsertLineBreakCommand.cpp b/Source/core/editing/InsertLineBreakCommand.cpp
index dc10873ba4a19da0da5ad8fb8db7d52c2cc14df2..2c3c86644721668012ddab73814c0ebc8e21ef01 100644
--- a/Source/core/editing/InsertLineBreakCommand.cpp
+++ b/Source/core/editing/InsertLineBreakCommand.cpp
@@ -81,7 +81,7 @@ void InsertLineBreakCommand::doApply()
 
     pos = positionOutsideTabSpan(pos);
 
-    RefPtr<Node> nodeToInsert;
+    RefPtrWillBeRawPtr<Node> nodeToInsert = nullptr;
     if (shouldUseBreakElement(pos))
         nodeToInsert = createBreakElement(document());
     else
@@ -141,7 +141,7 @@ void InsertLineBreakCommand::doApply()
 
     // Handle the case where there is a typing style.
 
-    RefPtr<EditingStyle> typingStyle = document().frame()->selection().typingStyle();
+    RefPtrWillBeRawPtr<EditingStyle> typingStyle = document().frame()->selection().typingStyle();
 
     if (typingStyle && !typingStyle->isEmpty()) {
         // Apply the typing style to the inserted line break, so that if the selection