Stop using the nacl_secure_random_init() which is deprecated.

base/rand_util_nacl.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 "base/rand_util.h"
 
 #include <nacl/nacl_random.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 
 namespace {
 
 void GetRandomBytes(void* output, size_t num_bytes) {
-  CHECK_EQ(0, nacl_secure_random_init());
   char* output_ptr = static_cast<char*>(output);
   while (num_bytes > 0) {
     size_t nread;
     const int error = nacl_secure_random(output_ptr, num_bytes, &nread);
     CHECK_EQ(error, 0);
     CHECK_LE(nread, num_bytes);
     output_ptr += nread;
     num_bytes -= nread;
   }
 }
 
 }  // namespace
 
 namespace base {
 
 // NOTE: This function must be cryptographically secure. http://crbug.com/140076
 uint64 RandUint64() {
   uint64 result;
   GetRandomBytes(&result, sizeof(result));
   return result;
 }
 
 void RandBytes(void* output, size_t output_length) {
   GetRandomBytes(output, output_length);
 }
 
 }  // namespace base