Remove some unused NaCl srpc methods (AttachService, ctor variant)

components/nacl/renderer/plugin/srpc_params.h

Index: components/nacl/renderer/plugin/srpc_params.h
diff --git a/components/nacl/renderer/plugin/srpc_params.h b/components/nacl/renderer/plugin/srpc_params.h
index ff24442798199d5f6c9b1f1c60bd2f9ade447285..1052b6f895041280cdb126df0980a487aeb785c6 100644
--- a/components/nacl/renderer/plugin/srpc_params.h
+++ b/components/nacl/renderer/plugin/srpc_params.h
@@ -21,12 +21,6 @@ class SrpcParams {
     memset(outs_, 0, sizeof(outs_));
   }
 
-  SrpcParams(const char* in_types, const char* out_types) {
-    if (!Init(in_types, out_types)) {
-      FreeAll();
-    }
-  }
-
   ~SrpcParams() {
     FreeAll();
   }