cros: Remove some OS platform ifdefs from ash

ash/content/shell_content_state.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 ASH_CONTENT_SHELL_CONTENT_STATE_H_
 #define ASH_CONTENT_SHELL_CONTENT_STATE_H_
 
 #include "ash/content/ash_with_content_export.h"
+#include "ash/content/screen_orientation_delegate_chromeos.h"
 #include "ash/public/cpp/session_types.h"
 #include "base/macros.h"
 
-#if defined(OS_CHROMEOS)
-#include "ash/content/screen_orientation_delegate_chromeos.h"
-#endif
 
 namespace aura {
 class Window;
 }
 
 namespace content {
 class BrowserContext;
 }
 
 namespace ash {
@@ skipping 18 matching lines @@
 
   // Returns the browser context on which the window is currently shown. NULL
   // means the window will be shown for every user.
   virtual content::BrowserContext* GetUserPresentingBrowserContextForWindow(
       aura::Window* window) = 0;
 
  protected:
   ShellContentState();
   virtual ~ShellContentState();
 
-#if defined(OS_CHROMEOS)
   ScreenOrientationDelegateChromeos orientation_delegate_;
-#endif
 
  private:
   static ShellContentState* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellContentState);
 };
 
 }  // namespace ash
 
 #endif  // ASH_CONTENT_SHELL_CONTENT_STATE_H_