Delete IPC::ChannelPosix, IPC::ChannelWin and IPC::AttachmentBroker.

ipc/ipc_channel_nacl.cc

Index: ipc/ipc_channel_nacl.cc
diff --git a/ipc/ipc_channel_nacl.cc b/ipc/ipc_channel_nacl.cc
index 34fd30287f5971aa230507624c747605b27e7238..e120b9dff0a3ef5c90edd9906bdbda3ed6789de8 100644
--- a/ipc/ipc_channel_nacl.cc
+++ b/ipc/ipc_channel_nacl.cc
@@ -225,10 +225,6 @@ bool ChannelNacl::Send(Message* message) {
   return true;
 }
 
-AttachmentBroker* ChannelNacl::GetAttachmentBroker() {
-  return nullptr;
-}
-
 void ChannelNacl::DidRecvMsg(std::unique_ptr<MessageContents> contents) {
   // Close sets the pipe to -1. It's possible we'll get a buffer sent to us from
   // the reader thread after Close is called. If so, we ignore it.
@@ -392,10 +388,6 @@ base::ProcessId ChannelNacl::GetSenderPID() {
   return base::kNullProcessId;
 }
 
-bool ChannelNacl::IsAttachmentBrokerEndpoint() {
-  return is_attachment_broker_endpoint();
-}
-
 // Channel's methods
 
 // static