uses: utilize modern dependency API

Library/Homebrew/cmd/uses.rb

@@ -12,20 +12,17 @@ module Homebrew extend self
     uses = Formula.select do |f|
       ARGV.formulae.all? do |ff|
         if ARGV.flag? '--recursive'
-          f.recursive_deps.include? ff
+          f.recursive_dependencies.any? { |dep| dep.name == ff.name }
         else
-          f.deps.include? ff
+          f.deps.any? { |dep| dep.name == ff.name }
         end
       end
     end
 
     if ARGV.include? "--installed"
-      uses = uses.select do |f|
-        keg = HOMEBREW_CELLAR/f
-        keg.directory? and not keg.subdirs.empty?
-      end
+      uses = uses.select { |f| Formula.installed.include? f }
     end
 
-    puts_columns uses.map{|f| f.to_s}.sort
+    puts_columns uses.map(&:to_s).sort
   end
 end