bugfix: ruby code-gen capitalization
	Change on 2015/01/06 by temiola <temiola@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=83391912
diff --git a/src/compiler/ruby_plugin.cc b/src/compiler/ruby_plugin.cc
index 73d1508..62229f9 100644
--- a/src/compiler/ruby_plugin.cc
+++ b/src/compiler/ruby_plugin.cc
@@ -62,7 +62,7 @@
     }
 
     std::unique_ptr<google::protobuf::io::ZeroCopyOutputStream> output(
-        context->OpenForInsert(file_name, "module_scope"));
+        context->Open(file_name));
     google::protobuf::io::CodedOutputStream coded_out(output.get());
     string code = grpc_ruby_generator::GetServices(file);
     coded_out.WriteRaw(code.data(), code.size());