revert "virtualSize" name change

Commit b717de5153db503fae61c11e30f04f400f66a6fd
changed the name of the "size" argument to
"virtualSize", as the "VirtualSize" field
was re-used for calculating the size of all
layers _not_ used by other images.

be20dc15af0cb281bd6d11586cfcc96bd50d12ca reverted
the change in calculation, but did not change
the argument name back to "size".

This changes the name back to its original
name, because since the introduction of the
content-addressable store in docker 1.10,
there no longer is a "virtual" size, so
"size" is a better name for this argument.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/images.go

@@ -315,13 +315,13 @@ func (daemon *Daemon) SquashImage(id, parent string) (string, error) {
 	return string(newImgID), nil
 }
 
-func newImage(image *image.Image, virtualSize int64) *types.ImageSummary {
+func newImage(image *image.Image, size int64) *types.ImageSummary {
 	newImage := new(types.ImageSummary)
 	newImage.ParentID = image.Parent.String()
 	newImage.ID = image.ID().String()
 	newImage.Created = image.Created.Unix()
-	newImage.Size = virtualSize
-	newImage.VirtualSize = virtualSize
+	newImage.Size = size
+	newImage.VirtualSize = size
 	newImage.SharedSize = -1
 	newImage.Containers = -1
 	if image.Config != nil {