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

chrome/common/ipc_channel_posix.h

 // Copyright (c) 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.
 
 #ifndef CHROME_COMMON_IPC_CHANNEL_POSIX_H_
 #define CHROME_COMMON_IPC_CHANNEL_POSIX_H_
 
 #include "chrome/common/ipc_channel.h"
 
 #include <sys/socket.h>  // for CMSG macros
 
 #include <queue>
 #include <string>
 #include <vector>
 
 #include "base/message_loop.h"
 #include "chrome/common/file_descriptor_set_posix.h"
 
 namespace IPC {
 
 // Store that channel name |name| is available via socket |socket|.
 // Used when the channel has been precreated by another process on
 // our behalf and they've just shipped us the socket.
 void AddChannelSocket(const std::string& name, int socket);
 
+// Remove the channel name mapping, and close the corresponding socket.
+void RemoveAndCloseChannelSocket(const std::string& name);
+
 // Construct a socket pair appropriate for IPC: UNIX domain, nonblocking.
 // Returns false on error.
 bool SocketPair(int* fd1, int* fd2);
 
 // An implementation of ChannelImpl for POSIX systems that works via
 // socketpairs.  See the .cc file for an overview of the implementation.
 class Channel::ChannelImpl : public MessageLoopForIO::Watcher {
  public:
   // Mirror methods of Channel, see ipc_channel.h for description.
   ChannelImpl(const std::string& channel_id, Mode mode, Listener* listener);
@@ skipping 87 matching lines @@
   bool processing_incoming_;
 
   ScopedRunnableMethodFactory<ChannelImpl> factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelImpl);
 };
 
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_IPC_CHANNEL_POSIX_H_