workaround for mac kernel bug

ipc/ipc_channel_reader.cc

Index: ipc/ipc_channel_reader.cc
diff --git a/ipc/ipc_channel_reader.cc b/ipc/ipc_channel_reader.cc
index 9055deb17759d39ebd82b22083b2e8609a15827e..2ee7449ea8de33a7d85b7bebadf30c4fe42549f5 100644
--- a/ipc/ipc_channel_reader.cc
+++ b/ipc/ipc_channel_reader.cc
@@ -38,9 +38,15 @@ bool ChannelReader::AsyncReadComplete(int bytes_read) {
   return DispatchInputData(input_buf_, bytes_read);
 }
 
+bool ChannelReader::IsInternalMessage(const Message& m) const {
+  return m.routing_id() == MSG_ROUTING_NONE &&
+      m.type() >= Channel::CLOSE_FD_MESSAGE_TYPE &&
+      m.type() <= Channel::HELLO_MESSAGE_TYPE;
+}
+
 bool ChannelReader::IsHelloMessage(const Message& m) const {
   return m.routing_id() == MSG_ROUTING_NONE &&
-         m.type() == Channel::HELLO_MESSAGE_TYPE;
+      m.type() == Channel::HELLO_MESSAGE_TYPE;
 }
 
 bool ChannelReader::DispatchInputData(const char* input_data,
@@ -84,8 +90,8 @@ bool ChannelReader::DispatchInputData(const char* input_data,
                    "line", IPC_MESSAGE_ID_LINE(m.type()));
 #endif
       m.TraceMessageEnd();
-      if (IsHelloMessage(m))
-        HandleHelloMessage(m);
+      if (IsInternalMessage(m))
+        HandleInternalMessage(m);
       else
         listener_->OnMessageReceived(m);
       p = message_tail;