Move DIP translation from ui/aura to ui/compositor

ui/gfx/size_f.h

 // Copyright (c) 2012 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 UI_GFX_SIZE_F_H_
 #define UI_GFX_SIZE_F_H_
 #pragma once
 
 #include <string>
 
 #include "ui/base/ui_export.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/size_base.h"
 
-#if !defined(ENABLE_DIP)
-#error "This class should be used only when DIP feature is enabled"
-#endif
-
 namespace gfx {
 
 // A floating version of gfx::Size.
 class UI_EXPORT SizeF : public SizeBase<SizeF, float> {
  public:
   SizeF();
   SizeF(float width, float height);
   ~SizeF();
 
   Size ToSize() const;
 
   std::string ToString() const;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SIZE_F_H_