gfx: Make conversions from Size to SizeF be explicit.

ui/gfx/win/dpi.cc

Index: ui/gfx/win/dpi.cc
diff --git a/ui/gfx/win/dpi.cc b/ui/gfx/win/dpi.cc
index aa3194c388eab5e0f3240eefb701175a777a4e62..508a2c776c3d49542eada9b76cd8aca48adcc6a7 100644
--- a/ui/gfx/win/dpi.cc
+++ b/ui/gfx/win/dpi.cc
@@ -92,12 +92,12 @@ Rect DIPToScreenRect(const Rect& dip_bounds) {
 
 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) {