[mojo-edk] Make the Mojo EDK compile under NaCl.

mojo/edk/embedder/embedder.cc

 // Copyright 2014 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 "mojo/edk/embedder/embedder.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
+#include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
-#include "crypto/random.h"
 #include "mojo/edk/embedder/embedder_internal.h"
 #include "mojo/edk/embedder/platform_channel_pair.h"
 #include "mojo/edk/embedder/process_delegate.h"
 #include "mojo/edk/system/core.h"
 
+#if !defined(OS_NACL)
+#include "crypto/random.h"
+#endif
+
 namespace mojo {
 namespace edk {
 
 class Core;
 class PlatformSupport;
 
 namespace internal {
 
 Core* g_core;
 ProcessDelegate* g_process_delegate;
@@ skipping 99 matching lines @@
   return internal::g_core->CreateParentMessagePipe(token);
 }
 
 ScopedMessagePipeHandle CreateChildMessagePipe(const std::string& token) {
   CHECK(internal::g_process_delegate);
   return internal::g_core->CreateChildMessagePipe(token);
 }
 
 std::string GenerateRandomToken() {
   char random_bytes[16];
+#if defined(OS_NACL)
+  // Not secure. For NaCl only!
+  base::RandBytes(random_bytes, 16);
+#else
   crypto::RandBytes(random_bytes, 16);
+#endif
   return base::HexEncode(random_bytes, 16);
 }
 
 }  // namespace edk
 }  // namespace mojo