gfx: Make conversions from Size to SizeF be explicit.

extensions/browser/extension_icon_image.cc

Index: extensions/browser/extension_icon_image.cc
diff --git a/extensions/browser/extension_icon_image.cc b/extensions/browser/extension_icon_image.cc
index 023879f10cb562925b5f1cb5f5186a7bb69fcf55..c0ab8d5d6cd7ff38cb3d8690e0a37322ffa62c1f 100644
--- a/extensions/browser/extension_icon_image.cc
+++ b/extensions/browser/extension_icon_image.cc
@@ -196,10 +196,9 @@ gfx::ImageSkiaRep IconImage::LoadImageForScaleFactor(
 
   std::vector<ImageLoader::ImageRepresentation> info_list;
   info_list.push_back(ImageLoader::ImageRepresentation(
-      resource,
-      ImageLoader::ImageRepresentation::ALWAYS_RESIZE,
-      gfx::ToFlooredSize(gfx::ScaleSize(
-          gfx::Size(resource_size_in_dip_, resource_size_in_dip_), scale)),
+      resource, ImageLoader::ImageRepresentation::ALWAYS_RESIZE,
+      gfx::ScaleToFlooredSize(
+          gfx::Size(resource_size_in_dip_, resource_size_in_dip_), scale),
       scale_factor));
 
   extensions::ImageLoader* loader =