Make ServiceWorkerFetchRequest and ServiceWorkerResponse header maps case insensitive

ipc/ipc_message_utils.h

Index: ipc/ipc_message_utils.h
diff --git a/ipc/ipc_message_utils.h b/ipc/ipc_message_utils.h
index 6bfd103c6d88423cc3855eefd821c0a07416d4e1..34ec17db177127f8a9af58cb42d27bf6d3182409 100644
--- a/ipc/ipc_message_utils.h
+++ b/ipc/ipc_message_utils.h
@@ -364,9 +364,9 @@ struct ParamTraits<std::set<P> > {
   }
 };
 
-template <class K, class V>
-struct ParamTraits<std::map<K, V> > {
-  typedef std::map<K, V> param_type;
+template <class K, class V, class C>

[Tom Sepez, 2014/09/23 18:01:03]

while we're at it, do we want to add a 4th parameter |class A| to cover the case
where someone makes a map with a custom allocator, since std::map is spec'd with
4 params?

[jkarlin, 2014/09/23 18:35:48]

Done.

+struct ParamTraits<std::map<K, V, C> > {
+  typedef std::map<K, V, C> param_type;
   static void Write(Message* m, const param_type& p) {
     WriteParam(m, static_cast<int>(p.size()));
     typename param_type::const_iterator iter;