script: Use an FNV hash to hash event listeners.

The security properties of SipHash are irrelevant for event listeners
and the creation of the random number generator was showing up high in
the profiles.

1 files changed, 4 insertions, 2 deletions

diff --git a/components/script/dom/bindings/trace.rs b/components/script/dom/bindings/trace.rs
index 930fd59edbe..c4f59491c57 100644
--- a/components/script/dom/bindings/trace.rs
+++ b/components/script/dom/bindings/trace.rs
@@ -39,7 +39,7 @@ use msg::constellation_msg::{PipelineId, SubpageId, WindowSizeData};
 use net::image_cache_task::ImageCacheTask;
 use script_traits::ScriptControlChan;
 use std::collections::hashmap::HashMap;
-use collections::hash::Hash;
+use collections::hash::{Hash, Hasher};
 use style::PropertyDeclarationBlock;
 use std::comm::{Receiver, Sender};
 use string_cache::{Atom, Namespace};
@@ -170,7 +170,9 @@ impl<T: JSTraceable> JSTraceable for Option<T> {
     }
 }
 
-impl<K: Eq+Hash+JSTraceable, V: JSTraceable> JSTraceable for HashMap<K, V> {
+impl<K,V,S,H> JSTraceable for HashMap<K, V, H> where K: Eq + Hash<S> + JSTraceable,
+                                                     V: JSTraceable,
+                                                     H: Hasher<S> {
     #[inline]
     fn trace(&self, trc: *mut JSTracer) {
         for e in self.iter() {