Remove Message::Sender and Channel::Listener typedefs.

ipc/ipc_test_sink.cc

Index: ipc/ipc_test_sink.cc
diff --git a/ipc/ipc_test_sink.cc b/ipc/ipc_test_sink.cc
index 44042390727c75455a5758e16cb55c1be521610a..2dc889841fe8eb6f1475c146b7abcfa4daf20e43 100644
--- a/ipc/ipc_test_sink.cc
+++ b/ipc/ipc_test_sink.cc
@@ -21,8 +21,8 @@ bool TestSink::Send(Message* message) {
 }
 
 bool TestSink::OnMessageReceived(const Message& msg) {
-  ObserverListBase<Channel::Listener>::Iterator it(filter_list_);
-  Channel::Listener* observer;
+  ObserverListBase<Listener>::Iterator it(filter_list_);
+  Listener* observer;
   while ((observer = it.GetNext()) != NULL) {
     if (observer->OnMessageReceived(msg))
       return true;
@@ -65,11 +65,11 @@ const Message* TestSink::GetUniqueMessageMatching(uint32 id) const {
   return &messages_[found_index];
 }
 
-void TestSink::AddFilter(Channel::Listener* filter) {
+void TestSink::AddFilter(Listener* filter) {
   filter_list_.AddObserver(filter);
 }
 
-void TestSink::RemoveFilter(Channel::Listener* filter) {
+void TestSink::RemoveFilter(Listener* filter) {
   filter_list_.RemoveObserver(filter);
 }