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

chrome/common/ipc_channel_posix.h

Index: chrome/common/ipc_channel_posix.h
diff --git a/chrome/common/ipc_channel_posix.h b/chrome/common/ipc_channel_posix.h
index 5e8d977192f5b0ec9f6e09dd60e6614bfeb73c2f..9b4157ed0d22d0ead2fca821c93f9e96056b5cef 100644
--- a/chrome/common/ipc_channel_posix.h
+++ b/chrome/common/ipc_channel_posix.h
@@ -23,6 +23,9 @@ namespace IPC {
 // 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);