Move UndoStack from Page to Editor

third_party/WebKit/Source/core/editing/Editor.h

Index: third_party/WebKit/Source/core/editing/Editor.h
diff --git a/third_party/WebKit/Source/core/editing/Editor.h b/third_party/WebKit/Source/core/editing/Editor.h
index e2bd766a26d295c6f3010f3a02cfe89e87d24b9d..a80bae98d764c9001859b9fedf02156bde765477 100644
--- a/third_party/WebKit/Source/core/editing/Editor.h
+++ b/third_party/WebKit/Source/core/editing/Editor.h
@@ -233,6 +233,8 @@ public:
     EditorParagraphSeparator defaultParagraphSeparator() const { return m_defaultParagraphSeparator; }
     void setDefaultParagraphSeparator(EditorParagraphSeparator separator) { m_defaultParagraphSeparator = separator; }
 
+    UndoStack& undoStack() const;
+
     static void tidyUpHTMLStructure(Document&);
 
     class RevealSelectionScope {
@@ -253,6 +255,7 @@ public:
 private:
     Member<LocalFrame> m_frame;
     Member<CompositeEditCommand> m_lastEditCommand;
+    Member<UndoStack> m_undoStack;
     int m_preventRevealSelection;
     bool m_shouldStartNewKillRingSequence;
     bool m_shouldStyleWithCSS;
@@ -273,8 +276,6 @@ private:
     bool canDeleteRange(const EphemeralRange&) const;
     bool shouldDeleteRange(const EphemeralRange&) const;
 
-    UndoStack* undoStack() const;
-
     bool tryDHTMLCopy();
     bool tryDHTMLCut();
     bool tryDHTMLPaste(PasteMode);