Do not convert from RectF to Rect by flooring.

ui/gfx/size_base_impl.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.
-
-#include "ui/gfx/size_base.h"
-
-#include "base/logging.h"
-#include "base/stringprintf.h"
-
-// This file provides the implementation for SizeBaese template and
-// used to instantiate the base class for Size and SizeF classes.
-#if !defined(UI_IMPLEMENTATION)
-#error "This file is intended for UI implementation only"
-#endif
-
-namespace gfx {
-
-template<typename Class, typename Type>
-SizeBase<Class, Type>::SizeBase(Type width, Type height) {
-  set_width(width);
-  set_height(height);
-}
-
-template<typename Class, typename Type>
-SizeBase<Class, Type>::~SizeBase() {}
-
-template<typename Class, typename Type>
-void SizeBase<Class, Type>::set_width(Type width) {
-  if (width < 0) {
-    NOTREACHED() << "negative width:" << width;
-    width = 0;
-  }
-  width_ = width;
-}
-
-template<typename Class, typename Type>
-void SizeBase<Class, Type>::set_height(Type height) {
-  if (height < 0) {
-    NOTREACHED() << "negative height:" << height;
-    height = 0;
-  }
-  height_ = height;
-}
-
-}  // namespace gfx