gfx: Make conversions from Size to SizeF be explicit.

ui/gfx/win/dpi.cc

 // 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/win/dpi.h"
 
 #include <windows.h>
 #include "base/win/scoped_hdc.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/point_conversions.h"
@@ skipping 74 matching lines @@
 }
 
 Rect DIPToScreenRect(const Rect& dip_bounds) {
   // See comment in ScreenToDIPRect for why we calculate size like this.
   return Rect(DIPToScreenPoint(dip_bounds.origin()),
               DIPToScreenSize(dip_bounds.size()));
 }
 
 Size ScreenToDIPSize(const Size& size_in_pixels) {
   // Always ceil sizes. Otherwise we may be leaving off part of the bounds.
-  return ToCeiledSize(ScaleSize(size_in_pixels, 1.0f / GetDPIScale()));
+  return ScaleToCeiledSize(size_in_pixels, 1.0f / GetDPIScale());
 }
 
 Size DIPToScreenSize(const Size& dip_size) {
   // Always ceil sizes. Otherwise we may be leaving off part of the bounds.
-  return ToCeiledSize(ScaleSize(dip_size, GetDPIScale()));
+  return ScaleToCeiledSize(dip_size, GetDPIScale());
 }
 
 int GetSystemMetricsInDIP(int metric) {
   return static_cast<int>(GetSystemMetrics(metric) / GetDPIScale() + 0.5);
 }
 
 }  // namespace win
 }  // namespace gfx