Revert "Don't output transparent in css2 ouput."

Transparent is a legal value in css2.

This reverts commit 119ce9d018.

lib/compass/sass_extensions/monkey_patches/browser_support.rb

@@ -92,22 +92,4 @@ module Sass::Script
     end
   end
 
-  class String < Literal
-    def supports?(aspect)
-      aspect == "css2" && value == "transparent" && type == :identifier 
-    end
-
-    def has_aspect?
-      true
-    end
-
-    def to_css2(options = self.options)
-      if value == "transparent" && type == :identifier
-        Sass::Script::String.new("")
-      else
-        dup
-      end
-    end
-  end
-
 end

test/sass_extensions_test.rb

@@ -87,7 +87,6 @@ class SassExtensionsTest < Test::Unit::TestCase
     assert_equal "true", evaluate("blank('')")
     assert_equal "true", evaluate("blank(' ')")
     assert_equal "true", evaluate("blank(-compass-space-list(' '))")
-    assert_equal " ", evaluate("-css2(transparent linear-gradient(#fff,#000))")
   end
 
 protected