[mus+ash] Removes WmWindow from ash/wm/overview and ash/wm/workspace

ash/aura/shell_port_classic.h

Index: ash/aura/shell_port_classic.h
diff --git a/ash/aura/shell_port_classic.h b/ash/aura/shell_port_classic.h
index f2e02a154ca0582ccaff4706e5e22a8fb619955b..2143ee8d49f3562f20f367b194142abb94d8fc52 100644
--- a/ash/aura/shell_port_classic.h
+++ b/ash/aura/shell_port_classic.h
@@ -43,7 +43,7 @@ class ASH_EXPORT ShellPortClassic : public ShellPort,
   display::Display GetFirstDisplay() const override;
   bool IsInUnifiedMode() const override;
   bool IsInUnifiedModeIgnoreMirroring() const override;
-  void SetDisplayWorkAreaInsets(WmWindow* window,
+  void SetDisplayWorkAreaInsets(aura::Window* window,
                                 const gfx::Insets& insets) override;
   std::unique_ptr<display::TouchTransformSetter> CreateTouchTransformDelegate()
       override;
@@ -65,7 +65,7 @@ class ASH_EXPORT ShellPortClassic : public ShellPort,
   std::unique_ptr<wm::TabletModeEventHandler> CreateTabletModeEventHandler()
       override;
   std::unique_ptr<WorkspaceEventHandler> CreateWorkspaceEventHandler(
-      WmWindow* workspace_window) override;
+      aura::Window* workspace_window) override;
   std::unique_ptr<ScopedDisableInternalMouseAndKeyboard>
   CreateScopedDisableInternalMouseAndKeyboard() override;
   std::unique_ptr<ImmersiveFullscreenController>