Remove dependency from //mojo to //crypto

mojo/dart/embedder/dart_controller.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 "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
+#include "base/rand_util.h"
 #include "base/sys_info.h"
-#include "crypto/random.h"
 #include "dart/runtime/include/dart_api.h"
 #include "dart/runtime/include/dart_native_api.h"
 #include "mojo/dart/embedder/builtin.h"
 #include "mojo/dart/embedder/dart_controller.h"
 #include "mojo/dart/embedder/dart_debugger.h"
 #include "mojo/dart/embedder/isolate_data.h"
 #include "mojo/dart/embedder/vmservice.h"
 #include "mojo/public/c/system/core.h"
 
 namespace mojo {
@@ skipping 630 matching lines @@
   result = Dart_RunLoop();
   DART_CHECK_VALID(result);
 
   Dart_ExitScope();
   Dart_ShutdownIsolate();
   Dart_Cleanup();
   return true;
 }
 
 static bool generateEntropy(uint8_t* buffer, intptr_t length) {
-  crypto::RandBytes(reinterpret_cast<void*>(buffer), length);
+  base::RandBytes(reinterpret_cast<void*>(buffer), length);
   return true;
 }
 
 bool DartController::Initialize(
     DartControllerServiceConnector* service_connector,
     bool strict_compilation) {
   service_connector_ = service_connector;
   strict_compilation_ = strict_compilation;
   InitVmIfNeeded(generateEntropy, nullptr, 0);
   return true;
@@ skipping 69 matching lines @@
 
 void DartController::Shutdown() {
   StopHandleWatcherIsolate();
   Dart_Cleanup();
   service_isolate_running_ = false;
   initialized_ = false;
 }
 
 }  // namespace apps
 }  // namespace mojo