message: Remove quote feature use
diff: @@ -227,7 +227,7 @@ fn plugin_deps() {
  .file(
  "src/lib.rs",
  r#"
  - #![feature(plugin_registrar, quote, rustc_private)]
  + #![feature(plugin_registrar, rustc_private)]
  extern crate rustc_plugin;
  extern crate syntax;
  @@ -334,7 +334,7 @@ fn plugin_to_the_max() {
  .file(
  "src/lib.rs",
  r#"
  - #![feature(plugin_registrar, quote, rustc_private)]
  + #![feature(plugin_registrar, rustc_private)]
  extern crate rustc_plugin;
  extern crate syntax;
  