Add ChannelPosix::ResetSafely() to deal with a lingering crash

ipc/ipc_channel_posix.h

Index: ipc/ipc_channel_posix.h
diff --git a/ipc/ipc_channel_posix.h b/ipc/ipc_channel_posix.h
index a792afa39163dc2503145e0bf654dedab2fc1ac8..a65283d3beace7fafdd02f9c74b9acb68ad84b96 100644
--- a/ipc/ipc_channel_posix.h
+++ b/ipc/ipc_channel_posix.h
@@ -202,6 +202,10 @@ class IPC_EXPORT ChannelPosix : public Channel,
   // implementation!
   std::vector<int> input_fds_;
 
+
+  void ResetSafely(base::ScopedFD* fd);
+  bool in_dtor_;
+
 #if defined(OS_MACOSX)
   // On OSX, sent FDs must not be closed until we get an ack.
   // Keep track of sent FDs here to make sure the remote is not