Close the handle to the child process after terminating it. This avoids...

chrome/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2006-2008 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include "build/build_config.h"
@@ skipping 553 matching lines @@
   // TODO(port): the above is the only reason this file pulls in
   // RenderWidgetHost and RenderViewHost.
   // Perhaps IPC::Channel::Listener needs another method like CanTerminate()?
   // No matter what, some abstractions are getting broken here...
   NOTIMPLEMENTED();
 #endif
 
   // Otherwise, we're allowed to just terminate the process. Using exit code 0
   // means that UMA won't treat this as a renderer crash.
   process_.Terminate(ResultCodes::NORMAL_EXIT);
+  process_.Close();
   return true;
 }
 
 bool BrowserRenderProcessHost::Send(IPC::Message* msg) {
   if (!channel_.get()) {
     delete msg;
     return false;
   }
   return channel_->Send(msg);
 }
@@ skipping 198 matching lines @@
   // child processes determine the pid of the parent.
   // Build the channel ID.  This is composed of a unique identifier for the
   // parent browser process, an identifier for the renderer/plugin instance,
   // and a random component. We use a random component so that a hacked child
   // process can't cause denial of service by causing future named pipe creation
   // to fail.
   return StringPrintf(L"%d.%x.%d",
                       base::GetCurrentProcId(), instance,
                       base::RandInt(0, std::numeric_limits<int>::max()));
 }