Remove dependency from //mojo to //crypto

mojo/edk/embedder/simple_platform_support.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/simple_platform_support.h"
 
-#include "crypto/random.h"
+#include "base/rand_util.h"
 #include "mojo/edk/embedder/simple_platform_shared_buffer.h"
 
 namespace mojo {
 namespace embedder {
 
 void SimplePlatformSupport::GetCryptoRandomBytes(void* bytes,
                                                  size_t num_bytes) {
-  crypto::RandBytes(bytes, num_bytes);
+  base::RandBytes(bytes, num_bytes);
 }
 
 PlatformSharedBuffer* SimplePlatformSupport::CreateSharedBuffer(
     size_t num_bytes) {
   return SimplePlatformSharedBuffer::Create(num_bytes);
 }
 
 PlatformSharedBuffer* SimplePlatformSupport::CreateSharedBufferFromHandle(
     size_t num_bytes,
     ScopedPlatformHandle platform_handle) {
   return SimplePlatformSharedBuffer::CreateFromPlatformHandle(
       num_bytes, platform_handle.Pass());
 }
 
 }  // namespace embedder
 }  // namespace mojo