Remove obsolete methods from IPC::Channel and related classes.

components/nacl/loader/nacl_ipc_adapter.cc

Index: components/nacl/loader/nacl_ipc_adapter.cc
diff --git a/components/nacl/loader/nacl_ipc_adapter.cc b/components/nacl/loader/nacl_ipc_adapter.cc
index 2d01c063443d9f36e2238b85dcb4098e00b692e7..33f74f8c1a13aa98837266356018a7231b8a4dce 100644
--- a/components/nacl/loader/nacl_ipc_adapter.cc
+++ b/components/nacl/loader/nacl_ipc_adapter.cc
@@ -478,12 +478,6 @@ NaClDesc* NaClIPCAdapter::MakeNaClDesc() {
   return MakeNaClDescCustom(this);
 }
 
-#if defined(OS_POSIX)
-base::ScopedFD NaClIPCAdapter::TakeClientFileDescriptor() {
-  return io_thread_data_.channel_->TakeClientFileDescriptor();
-}
-#endif
-
 bool NaClIPCAdapter::OnMessageReceived(const IPC::Message& msg) {
   uint32_t type = msg.type();