workaround for mac kernel bug

ipc/ipc_channel_reader.h

Index: ipc/ipc_channel_reader.h
diff --git a/ipc/ipc_channel_reader.h b/ipc/ipc_channel_reader.h
index 9c398bdce356791f6ba8e22e9174c5c989d190b4..130384659fc2fe9c146e2237058f93c5cb0da512 100644
--- a/ipc/ipc_channel_reader.h
+++ b/ipc/ipc_channel_reader.h
@@ -42,8 +42,12 @@ class ChannelReader {
   // data. See ReadData for more.
   bool AsyncReadComplete(int bytes_read);
 
-  // Returns true if the given message is the "hello" message sent on channel
-  // set-up.
+  // Returns true if the given message is internal to the IPC implementation,
+  // like the "hello" message sent on channel set-up.
+  bool IsInternalMessage(const Message& m) const;
+
+  // Returns true if the given message is an Hello message
+  // sent on channel set-up.
   bool IsHelloMessage(const Message& m) const;
 
  protected:
@@ -76,8 +80,8 @@ class ChannelReader {
   // though there could be more data ready to be read from the OS.
   virtual bool DidEmptyInputBuffers() = 0;
 
-  // Handles the first message sent over the pipe which contains setup info.
-  virtual void HandleHelloMessage(const Message& msg) = 0;
+  // Handles internal messages, like the hello message sent on channel startup.
+  virtual void HandleInternalMessage(const Message& msg) = 0;
 
  private:
   // Takes the given data received from the IPC channel and dispatches any