Revert 167062 - ui: Remove gfx::Size::ClampToNonNegative, prevent negative sizes always.

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"
-
-// This file provides the implementation for SizeBase 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>
-void SizeBase<Class, Type>::set_width(Type width) {
-  DCHECK(!(width < 0));
-  width_ = width < 0 ? 0 : width;
-}
-
-template<typename Class, typename Type>
-void SizeBase<Class, Type>::set_height(Type height) {
-  DCHECK(!(height < 0));
-  height_ = height < 0 ? 0 : height;
-}
-
-template<typename Class, typename Type>
-SizeBase<Class, Type>::SizeBase(Type width, Type height)
-    : width_(width < 0 ? 0 : width),
-      height_(height < 0 ? 0 : height) {
-  DCHECK(!(width < 0));
-  DCHECK(!(height < 0));
-}
-
-}  // namespace gfx