Convert a crash to a NOTREACHED.

ipc/ipc_platform_file.h

 // Copyright (c) 2009 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.
 
 #ifndef IPC_IPC_PLATFORM_FILE_H_
 #define IPC_IPC_PLATFORM_FILE_H_
 
 #include "base/basictypes.h"
 
 #include "base/platform_file.h"
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #endif
 
 namespace IPC {
 
 #if defined(OS_WIN)
 typedef base::PlatformFile PlatformFileForTransit;
 #elif defined(OS_POSIX)
 typedef base::FileDescriptor PlatformFileForTransit;
 #endif
 
+inline PlatformFileForTransit InvalidPlatformFileForTransit() {
+#if defined(OS_WIN)
+  return base::kInvalidPlatformFileValue;
+#elif defined(OS_POSIX)
+  return base::FileDescriptor();
+#endif
+}
+
 inline base::PlatformFile PlatformFileForTransitToPlatformFile(
     const PlatformFileForTransit& transit) {
 #if defined(OS_WIN)
   return transit;
 #elif defined(OS_POSIX)
   return transit.fd;
 #endif
 }
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_PLATFORM_FILE_H_