Remove redundant ::{self}

Summary:
Left after mass reformatting.

`foo::{self}` conversion to `foo` is not equivalent, that's why `rustfmt` doesn't do it.

Reviewed By: ndmitchell

Differential Revision: D37335581

fbshipit-source-id: df7de0dead5fa0ce735e963e1b977a8450cd7699

Author: stepancheg

gazebo_lint/src/clippy.rs

@@ -22,7 +22,6 @@ use rustc_hir::ExprKind;
 use rustc_hir::Impl;
 use rustc_hir::Item;
 use rustc_hir::ItemKind;
-use rustc_hir::{self};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::LateContext;
 use rustc_middle::traits;
@@ -31,7 +30,6 @@ use rustc_middle::ty::Ty;
 use rustc_middle::ty::TyKind;
 use rustc_span::symbol::Symbol;
 use rustc_span::Span;
-use rustc_span::{self};
 use rustc_trait_selection::traits::predicate_for_trait_def;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
 use rustc_typeck::hir_ty_to_ty;