Add methods to move ByteStrings underlying bytes

Add methods to move the underlying Vec<u8> for ByteString.

components/script/dom/bindings/str.rs

@@ -7,6 +7,7 @@
 use std::ascii::AsciiExt;
 use std::borrow::ToOwned;
 use std::hash::{Hash, Hasher};
+use std::mem;
 use std::ops;
 use std::str;
 use std::str::FromStr;
@@ -28,6 +29,12 @@ impl ByteString {
         str::from_utf8(&vec).ok()
     }
 
+    /// Returns ownership of the underlying Vec<u8> and copies an empty
+    /// vec in its place
+    pub fn bytes(&mut self) -> Vec<u8> {
+        mem::replace(&mut self.0, Vec::new())
+    }
+
     /// Returns the length.
     pub fn len(&self) -> usize {
         let ByteString(ref vector) = *self;
@@ -117,6 +124,12 @@ impl ByteString {
     }
 }
 
+impl Into<Vec<u8>> for ByteString {
+    fn into(self) -> Vec<u8> {
+        self.0
+    }
+}
+
 impl Hash for ByteString {
     fn hash<H: Hasher>(&self, state: &mut H) {
         let ByteString(ref vec) = *self;