Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/ruby/tests/stress.rb

-#!/usr/bin/ruby
-
-require 'google/protobuf'
-require 'test/unit'
-
-module StressTest
-  pool = Google::Protobuf::DescriptorPool.new
-  pool.build do
-    add_message "TestMessage" do
-      optional :a,  :int32,        1
-      repeated :b,  :message,      2, "M"
-    end
-    add_message "M" do
-      optional :foo, :string, 1
-    end
-  end
-
-  TestMessage = pool.lookup("TestMessage").msgclass
-  M = pool.lookup("M").msgclass
-
-  class StressTest < Test::Unit::TestCase
-    def get_msg
-      TestMessage.new(:a => 1000,
-                      :b => [M.new(:foo => "hello"),
-                             M.new(:foo => "world")])
-    end
-    def test_stress
-      m = get_msg
-      data = TestMessage.encode(m)
-      100_000.times do
-        mnew = TestMessage.decode(data)
-        mnew = mnew.dup
-        assert_equal mnew.inspect, m.inspect
-        assert TestMessage.encode(mnew) == data
-      end
-    end
-  end
-end