Fix compilation error of nacl_listener.cc on VS2012

chrome/nacl/nacl_listener.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 "chrome/nacl/nacl_listener.h"
 
 #include <errno.h>
 #include <stdlib.h>
 
 #include "base/command_line.h"
@@ skipping 120 matching lines @@
     }
   }
 
   virtual bool ResolveFileToken(struct NaClFileToken* file_token,
                                 int32* fd, std::string* path) OVERRIDE {
     *fd = -1;
     *path = "";
     if (file_token->lo == 0 && file_token->hi == 0) {
       return false;
     }
-    IPC::PlatformFileForTransit ipc_fd;
+    IPC::PlatformFileForTransit ipc_fd = IPC::InvalidPlatformFileForTransit();
     base::FilePath ipc_path;
     if (!listener_->Send(new NaClProcessMsg_ResolveFileToken(file_token->lo,
                                                              file_token->hi,
                                                              &ipc_fd,
                                                              &ipc_path))) {
       return false;
     }
     if (ipc_fd == IPC::InvalidPlatformFileForTransit()) {
       return false;
     }
@@ skipping 157 matching lines @@
 #if defined(OS_WIN)
   args->broker_duplicate_handle_func = BrokerDuplicateHandle;
   args->attach_debug_exception_handler_func = AttachDebugExceptionHandler;
 #endif
 #if defined(OS_LINUX)
   args->prereserved_sandbox_size = prereserved_sandbox_size_;
 #endif
   NaClChromeMainStart(args);
   NOTREACHED();
 }