Implement PPB_UDPSocket_Dev: part 2

ppapi/host/error_conversion.cc

 // Copyright 2013 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 "ppapi/host/error_conversion.h"
 
+#include "base/safe_numerics.h"
 #include "net/base/net_errors.h"
 #include "ppapi/c/pp_errors.h"
 
 namespace ppapi {
 namespace host {
 
 int32_t NetErrorToPepperError(int net_error) {
   if (net_error > 0)
-    return static_cast<int32_t>(net_error);
+    return base::checked_numeric_cast<int32_t>(net_error);
 
   switch (net_error) {
     case net::OK:
       return PP_OK;
     case net::ERR_IO_PENDING:
       return PP_OK_COMPLETIONPENDING;
     case net::ERR_ABORTED:
       return PP_ERROR_ABORTED;
     case net::ERR_INVALID_ARGUMENT:
       return PP_ERROR_BADARGUMENT;
@@ skipping 39 matching lines @@
       return PP_ERROR_MESSAGE_TOO_BIG;
     case net::ERR_ADDRESS_IN_USE:
       return PP_ERROR_ADDRESS_IN_USE;
     default:
       return PP_ERROR_FAILED;
   }
 }
 
 }  // namespace host
 }  // namespace ppapi