workaround for mac kernel bug

ipc/ipc_channel_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ipc/ipc_channel_win.h"
 
 #include <windows.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 134 matching lines @@
   return READ_PENDING;
 }
 
 bool Channel::ChannelImpl::WillDispatchInputMessage(Message* msg) {
   // Make sure we get a hello when client validation is required.
   if (validate_client_)
     return IsHelloMessage(*msg);
   return true;
 }
 
-void Channel::ChannelImpl::HandleHelloMessage(const Message& msg) {
+void Channel::ChannelImpl::HandleInternalMessage(const Message& msg) {
+  DCHECK_EQ(msg.type(), static_cast<unsigned>(Channel::HELLO_MESSAGE_TYPE));
   // The hello message contains one parameter containing the PID.
   PickleIterator it(msg);
   int32 claimed_pid;
   bool failed = !it.ReadInt(&claimed_pid);
 
   if (!failed && validate_client_) {
     int32 secret;
     failed = it.ReadInt(&secret) ? (secret != client_secret_) : true;
   }
 
@@ skipping 342 matching lines @@
   int secret;
   do {  // Guarantee we get a non-zero value.
     secret = base::RandInt(0, std::numeric_limits<int>::max());
   } while (secret == 0);
 
   id.append(GenerateUniqueRandomChannelID());
   return id.append(base::StringPrintf("\\%d", secret));
 }
 
 }  // namespace IPC