Decouple IPC::MessageFilter from IPC::Channel

ipc/ipc_channel_proxy.cc

Index: ipc/ipc_channel_proxy.cc
diff --git a/ipc/ipc_channel_proxy.cc b/ipc/ipc_channel_proxy.cc
index 7441c6543b6caaab7aa34ef18c8a439aedd233a1..8ba91b01d4db196f33cc1c8d0b74b13304a9f08e 100644
--- a/ipc/ipc_channel_proxy.cc
+++ b/ipc/ipc_channel_proxy.cc
@@ -111,7 +111,7 @@ void ChannelProxy::Context::OnChannelConnected(int32 peer_pid) {
 // Called on the IPC::Channel thread
 void ChannelProxy::Context::OnChannelError() {
   for (size_t i = 0; i < filters_.size(); ++i)
-    filters_[i]->OnChannelError();
+    filters_[i]->OnSenderError();
 
   // See above comment about using listener_task_runner_ here.
   listener_task_runner_->PostTask(
@@ -143,7 +143,7 @@ void ChannelProxy::Context::OnChannelClosed() {
     return;
 
   for (size_t i = 0; i < filters_.size(); ++i) {
-    filters_[i]->OnChannelClosing();
+    filters_[i]->OnSenderClosing();
     filters_[i]->OnFilterRemoved();
   }
 
@@ -199,7 +199,7 @@ void ChannelProxy::Context::OnAddFilter() {
     // The channel has already been created and connected, so we need to
     // inform the filters right now.
     new_filters[i]->OnFilterAdded(channel_.get());
-    new_filters[i]->OnChannelConnected(peer_pid_);
+    new_filters[i]->OnSenderConnected();
   }
 }