drop deprecated/unused silence_warnings methods

Author: kares

src/main/ruby/jruby/rack.rb

@@ -10,12 +10,7 @@
 module JRuby
   module Rack
 
-    # @deprecated use {JRuby::Rack::Helpers#silence_warnings} instead
-    def self.silence_warnings(&block)
-      Helpers.silence_warnings(&block)
-    end
-
-    def self.booter; @booter; end # :nodoc TODO do we need to keep after boot! ?!
+    def self.booter; @booter end # :nodoc TODO do we need to keep after boot! ?!
 
     class << self
 

src/main/ruby/jruby/rack/booter.rb

@@ -221,10 +221,6 @@ def expand_path(path); layout.expand_path(path) end
 
     private
 
-    def silence_warnings(&block)
-      Helpers.silence_warnings(&block)
-    end
-
     def path_to_file(url)
       url.toURI.toString
     rescue Java::JavaNet::URISyntaxException