HELLO_MESSAGE_TYPE   93 ipc/ipc_channel.h     CLOSE_FD_MESSAGE_TYPE = HELLO_MESSAGE_TYPE - 1
HELLO_MESSAGE_TYPE  764 ipc/ipc_channel_posix.cc                                       HELLO_MESSAGE_TYPE,
HELLO_MESSAGE_TYPE  983 ipc/ipc_channel_posix.cc     case Channel::HELLO_MESSAGE_TYPE:
HELLO_MESSAGE_TYPE   44 ipc/ipc_channel_reader.cc       m.type() <= Channel::HELLO_MESSAGE_TYPE;
HELLO_MESSAGE_TYPE   49 ipc/ipc_channel_reader.cc       m.type() == Channel::HELLO_MESSAGE_TYPE;
HELLO_MESSAGE_TYPE  156 ipc/ipc_channel_win.cc   DCHECK_EQ(msg.type(), static_cast<unsigned>(Channel::HELLO_MESSAGE_TYPE));
HELLO_MESSAGE_TYPE  272 ipc/ipc_channel_win.cc                                     HELLO_MESSAGE_TYPE,