Removes aura dependencies from WindowPositioner

ash/wm/aura/wm_globals_aura.h

Index: ash/wm/aura/wm_globals_aura.h
diff --git a/ash/wm/aura/wm_globals_aura.h b/ash/wm/aura/wm_globals_aura.h
new file mode 100644
index 0000000000000000000000000000000000000000..16f5e3a6f72643078356f470575ebec37f794e73
--- /dev/null
+++ b/ash/wm/aura/wm_globals_aura.h
@@ -0,0 +1,38 @@
+// Copyright 2016 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.
+
+#ifndef ASH_WM_AURA_WM_GLOBALS_AURA_H_
+#define ASH_WM_AURA_WM_GLOBALS_AURA_H_
+
+#include <set>
+
+#include "ash/ash_export.h"
+#include "ash/wm/common/wm_globals.h"
+#include "base/macros.h"
+
+namespace ash {
+namespace wm {
+
+class ASH_EXPORT WmGlobalsAura : public WmGlobals {
+ public:
+  WmGlobalsAura();
+  ~WmGlobalsAura() override;
+
+  static WmGlobalsAura* Get();
+
+  // WmGlobals:
+  WmWindow* GetActiveWindow() override;
+  WmWindow* GetRootWindowForNewWindows() override;
+  std::vector<WmWindow*> GetMruWindowListIgnoreModals() override;
+  bool IsForceMaximizeOnFirstRun() override;
+  std::vector<WmWindow*> GetAllRootWindows() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WmGlobalsAura);
+};
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_AURA_WM_GLOBALS_AURA_H_