PPAPI/NaCl: Fix leaky NaClIPCAdapter test.

ipc/ipc_channel_win.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_win.h"
 
 #include <windows.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 444 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 20 matching lines @@
   int secret;
   do {  // Guarantee we get a non-zero value.
     secret = base::RandInt(0, std::numeric_limits<int>::max());
   } while (secret == 0);
 
   id.append(GenerateUniqueRandomChannelID());
   return id.append(base::StringPrintf("\\%d", secret));
 }
 
 }  // namespace IPC