Remove unused method

Author: eightbitraptor

harness-ractor/harness.rb

@@ -27,15 +27,6 @@ def join
   end
 end
 
-def use_ractor_gemfile(filename)
-  filename = File.expand_path("Gemfile_#{filename}.rb", "benchmarks/ractor/gemfiles")
-  raise "Gemfile #{filename} doesn't exist" unless  File.exist?(filename)
-  use_inline_gemfile do
-    gem "fiddle" # for maxrss
-    instance_eval File.read(filename), filename, 1
-  end
-end
-
 MAX_ITERS = Integer(ENV.fetch("MAX_BENCH_ITRS", 5))
 
 def run_benchmark(num_itrs_hint, ractor_args: [], &block)