Remove IPC::Endpoint.

gpu/ipc/service/gpu_channel.cc

Index: gpu/ipc/service/gpu_channel.cc
diff --git a/gpu/ipc/service/gpu_channel.cc b/gpu/ipc/service/gpu_channel.cc
index fd71de85befb8eff4f660ca1fed4d21523783e04..29c189c5eda46f79b18bc4c4b744a8381d390bd9 100644
--- a/gpu/ipc/service/gpu_channel.cc
+++ b/gpu/ipc/service/gpu_channel.cc
@@ -643,7 +643,8 @@ base::WeakPtr<GpuChannel> GpuChannel::AsWeakPtr() {
 }
 
 base::ProcessId GpuChannel::GetClientPID() const {
-  return channel_->GetPeerPID();
+  DCHECK_NE(peer_pid_, base::kNullProcessId);
+  return peer_pid_;
 }
 
 uint32_t GpuChannel::GetProcessedOrderNum() const {
@@ -670,6 +671,10 @@ bool GpuChannel::OnMessageReceived(const IPC::Message& msg) {
   return false;
 }
 
+void GpuChannel::OnChannelConnected(int32_t peer_pid) {
+  peer_pid_ = peer_pid;
+}
+
 void GpuChannel::OnChannelError() {
   gpu_channel_manager_->RemoveChannel(client_id_);
 }