linux: fix renderer/plugin crash when loading multiple pages with plugins

chrome/plugin/plugin_channel.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.
 
 #include "chrome/plugin/plugin_channel.h"
 
 #include "base/command_line.h"
 #include "base/process_util.h"
 #include "base/string_util.h"
 #include "build/build_config.h"
@@ skipping 30 matching lines @@
   SendUnblockingOnlyDuringDispatch();
   ChildProcess::current()->AddRefProcess();
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   log_messages_ = command_line->HasSwitch(switches::kLogPluginMessages);
 }
 
 PluginChannel::~PluginChannel() {
   if (renderer_handle_)
     base::CloseProcessHandle(renderer_handle_);
 #if defined(OS_POSIX)
-  // If we still have the FD, close it.
+  IPC::RemoveAndCloseChannelSocket(channel_name());
+  // If we still have the renderer FD, close it.
   if (renderer_fd_ != -1) {
     close(renderer_fd_);
   }
 #endif
   ChildProcess::current()->ReleaseProcess();
 }
 
 bool PluginChannel::Send(IPC::Message* msg) {
   in_send_++;
   if (log_messages_) {
@@ skipping 92 matching lines @@
   // This gets called when the PluginChannel is initially created. At this
   // point, create the socketpair and assign the plugin side FD to the channel
   // name. Keep the renderer side FD as a member variable in the PluginChannel
   // to be able to transmit it through IPC.
   int plugin_fd;
   IPC::SocketPair(&plugin_fd, &renderer_fd_);
   IPC::AddChannelSocket(channel_name(), plugin_fd);
 #endif
   return PluginChannelBase::Init(ipc_message_loop, create_pipe_now);
 }