Removed the generated Ruby file from Makefile.am.
diff --git a/Makefile.am b/Makefile.am
index fbd27fc..3e21db8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -653,7 +653,6 @@
   ruby/tests/repeated_field_test.rb                                          \
   ruby/tests/stress.rb                                                       \
   ruby/tests/generated_code.proto                                            \
-  ruby/tests/generated_code.rb                                               \
   ruby/tests/generated_code_test.rb                                          \
   ruby/travis-test.sh