Makes WorkspaceLayoutManager use ash/wm/common types

ash/switchable_windows.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ash/switchable_windows.h"
-
-#include "ash/shell_window_ids.h"
-#include "ui/aura/window.h"
-
-namespace ash {
-
-const int kSwitchableWindowContainerIds[] = {
-    kShellWindowId_DefaultContainer,
-    kShellWindowId_AlwaysOnTopContainer,
-    kShellWindowId_DockedContainer,
-    kShellWindowId_PanelContainer,
-    kShellWindowId_AppListContainer};
-
-const size_t kSwitchableWindowContainerIdsLength =
-    arraysize(kSwitchableWindowContainerIds);
-
-bool IsSwitchableContainer(const aura::Window* window) {
-  if (!window)
-    return false;
-  for (size_t i = 0; i < kSwitchableWindowContainerIdsLength; ++i) {
-    if (window->id() == kSwitchableWindowContainerIds[i])
-      return true;
-  }
-  return false;
-}
-
-}  // namespace ash