Remove all blimp engine code

blimp/engine/app/ui/blimp_layout_manager.h

-// Copyright 2015 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 BLIMP_ENGINE_APP_UI_BLIMP_LAYOUT_MANAGER_H_
-#define BLIMP_ENGINE_APP_UI_BLIMP_LAYOUT_MANAGER_H_
-
-#include "base/macros.h"
-#include "ui/aura/layout_manager.h"
-
-namespace blimp {
-namespace engine {
-
-// A layout manager that sets the child window to occupy the full area of the
-// root window.
-class BlimpLayoutManager : public aura::LayoutManager {
- public:
-  // Caller retains the ownership of |root_window|.
-  explicit BlimpLayoutManager(aura::Window* root_window);
-  ~BlimpLayoutManager() override;
-
- private:
-  // aura::LayoutManager implementation.
-  void OnWindowResized() override;
-  void OnWindowAddedToLayout(aura::Window* child) override;
-  void OnWillRemoveWindowFromLayout(aura::Window* child) override;
-  void OnWindowRemovedFromLayout(aura::Window* child) override;
-  void OnChildWindowVisibilityChanged(aura::Window* child,
-                                      bool visible) override;
-  void SetChildBounds(aura::Window* child,
-                      const gfx::Rect& requested_bounds) override;
-
-  aura::Window* root_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlimpLayoutManager);
-};
-
-}  // namespace engine
-}  // namespace blimp
-
-#endif  // BLIMP_ENGINE_APP_UI_BLIMP_LAYOUT_MANAGER_H_