PPAPI/NaCl: Fix leaky NaClIPCAdapter test.

ipc/ipc_channel_posix.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ipc/ipc_channel_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/types.h>
@@ skipping 1108 matching lines @@
 
 Channel::~Channel() {
   delete channel_impl_;
 }
 
 bool Channel::Connect() {
   return channel_impl_->Connect();
 }
 
 void Channel::Close() {
-  channel_impl_->Close();
+  if (channel_impl_)
+    channel_impl_->Close();
 }
 
 void Channel::set_listener(Listener* listener) {
   channel_impl_->set_listener(listener);
 }
 
 base::ProcessId Channel::peer_pid() const {
   return channel_impl_->peer_pid();
 }
 
@@ skipping 44 matching lines @@
 
 
 #if defined(OS_LINUX)
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelImpl::SetGlobalPid(pid);
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC