Remove unused branches from Options.coerce

Library/Homebrew/options.rb

@@ -116,8 +116,6 @@ class Options
 
   def self.coerce(arg)
     case arg
-    when self then arg
-    when Option then new << arg
     when Array
       opts = new
       arg.each do |a|

Library/Homebrew/test/test_options.rb

@@ -132,15 +132,6 @@ class OptionsTests < Homebrew::TestCase
     assert_equal [foo, bar, baz].sort, (@options | options).to_a.sort
   end
 
-  def test_coerce_with_options
-    assert_same @options, Options.coerce(@options)
-  end
-
-  def test_coerce_with_option
-    option = Option.new("foo")
-    assert_equal option, Options.coerce(option).to_a.first
-  end
-
   def test_coerce_with_array
     array = %w{--foo --bar}
     option1 = Option.new("foo")