IPC::Channel: Reduce POSIX specific API surface

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 2f2a893edb10e6187629398c186fd08af43df456..7441c6543b6caaab7aa34ef18c8a439aedd233a1 100644
--- a/ipc/ipc_channel_proxy.cc
+++ b/ipc/ipc_channel_proxy.cc
@@ -436,15 +436,6 @@ int ChannelProxy::TakeClientFileDescriptor() {
   DCHECK(channel) << context_.get()->channel_id_;
   return channel->TakeClientFileDescriptor();
 }
-
-bool ChannelProxy::GetPeerEuid(uid_t* peer_euid) const {
-  DCHECK(CalledOnValidThread());
-
-  Channel* channel = context_.get()->channel_.get();
-  // Channel must have been created first.
-  DCHECK(channel) << context_.get()->channel_id_;
-  return channel->GetPeerEuid(peer_euid);
-}
 #endif
 
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