Move UndoStack from Page to Editor

third_party/WebKit/Source/core/page/Page.cpp

Index: third_party/WebKit/Source/core/page/Page.cpp
diff --git a/third_party/WebKit/Source/core/page/Page.cpp b/third_party/WebKit/Source/core/page/Page.cpp
index 270e298c1c35d0db22488e97117b180cc0310be5..ff71fae0c65ade2aa799053f8718ba2b8a3e55f3 100644
--- a/third_party/WebKit/Source/core/page/Page.cpp
+++ b/third_party/WebKit/Source/core/page/Page.cpp
@@ -24,7 +24,6 @@
 #include "core/dom/StyleChangeReason.h"
 #include "core/dom/VisitedLinkState.h"
 #include "core/editing/DragCaretController.h"
-#include "core/editing/commands/UndoStack.h"
 #include "core/editing/markers/DocumentMarkerController.h"
 #include "core/events/Event.h"
 #include "core/fetch/ResourceFetcher.h"
@@ -116,7 +115,6 @@ Page::Page(PageClients& pageClients)
     , m_focusController(FocusController::create(this))
     , m_contextMenuController(ContextMenuController::create(this, pageClients.contextMenuClient))
     , m_pointerLockController(PointerLockController::create(this))
-    , m_undoStack(UndoStack::create())
     , m_mainFrame(nullptr)
     , m_editorClient(pageClients.editorClient)
     , m_spellCheckerClient(pageClients.spellCheckerClient)
@@ -474,7 +472,6 @@ DEFINE_TRACE(Page)
     visitor->trace(m_contextMenuController);
     visitor->trace(m_pointerLockController);
     visitor->trace(m_scrollingCoordinator);
-    visitor->trace(m_undoStack);
     visitor->trace(m_mainFrame);
     visitor->trace(m_validationMessageClient);
     visitor->trace(m_frameHost);