Avoid warnings for duplicate imports (#517)

Author: djc

html5ever/src/tokenizer/mod.rs

@@ -28,7 +28,6 @@ use mac::format_if;
 use markup5ever::{namespace_url, ns, small_char_set};
 use std::borrow::Cow::{self, Borrowed};
 use std::collections::BTreeMap;
-use std::default::Default;
 use std::mem::replace;
 
 pub use crate::buffer_queue::{BufferQueue, FromSet, NotFromSet, SetResult};

xml5ever/examples/simple_xml_tokenizer.rs

@@ -12,7 +12,6 @@
 extern crate markup5ever;
 extern crate xml5ever;
 
-use std::default::Default;
 use std::io;
 
 use markup5ever::buffer_queue::BufferQueue;

xml5ever/examples/xml_tokenizer.rs

@@ -12,7 +12,6 @@
 extern crate markup5ever;
 extern crate xml5ever;
 
-use std::default::Default;
 use std::io;
 
 use markup5ever::buffer_queue::BufferQueue;

xml5ever/src/tree_builder/mod.rs

@@ -18,7 +18,6 @@ use std::collections::btree_map::Iter;
 use std::collections::{BTreeMap, HashSet, VecDeque};
 use std::fmt::{Debug, Error, Formatter};
 use std::mem;
-use std::result::Result;
 
 pub use self::interface::{NextParserState, NodeOrText, Tracer, TreeSink};
 use self::types::*;