ui: Make gfx::Size::Scale() mutate the class. Add gfx::ScaleSize() similar to Rect/Point.

chrome/browser/extensions/extension_icon_image.cc

Index: chrome/browser/extensions/extension_icon_image.cc
diff --git a/chrome/browser/extensions/extension_icon_image.cc b/chrome/browser/extensions/extension_icon_image.cc
index f748f2f933fbf18bc75db15cdc30f010366c050e..ee252e77ae68d979a2095f71d7dc9f66900356ca 100644
--- a/chrome/browser/extensions/extension_icon_image.cc
+++ b/chrome/browser/extensions/extension_icon_image.cc
@@ -193,8 +193,8 @@ gfx::ImageSkiaRep IconImage::LoadImageForScaleFactor(
   info_list.push_back(ImageLoadingTracker::ImageRepresentation(
       resource,
       ImageLoadingTracker::ImageRepresentation::ALWAYS_RESIZE,
-      gfx::ToFlooredSize(
-          gfx::Size(resource_size_in_dip_, resource_size_in_dip_).Scale(scale)),
+      gfx::ToFlooredSize(gfx::ScaleSize(
+          gfx::Size(resource_size_in_dip_, resource_size_in_dip_), scale)),
       scale_factor));
   tracker_.LoadImages(extension_, info_list, ImageLoadingTracker::DONT_CACHE);