Chomp excessive newlines.

features/support/helpers/dogtail.rb

@@ -148,6 +148,7 @@ module Dogtail
       ]
       a11y_at_spi_paths = run(find_paths_script_lines).stdout.chomp.split("\n")
                           .grep(Regexp.new('^/org/a11y/atspi/accessible/'))
+                          .map { |path| path.chomp }
       a11y_at_spi_paths.map do |path|
         more_init_lines = [
           "from dogtail import predicate",