Remove dependency from //mojo to //crypto

mojo/dart/embedder/test/dart_to_cpp_tests.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/at_exit.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
+#include "base/rand_util.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread.h"
-#include "crypto/random.h"
 #include "mojo/dart/embedder/dart_controller.h"
 #include "mojo/dart/embedder/test/dart_to_cpp.mojom.h"
 #include "mojo/edk/test/test_utils.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace dart {
@@ skipping 244 matching lines @@
 
  private:
   base::MessageLoop loop;
   base::RunLoop run_loop_;
 
   static void UnhandledExceptionCallback(bool* exception, Dart_Handle error) {
     *exception = 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;
   }
 
   static void InitializeDartConfig(DartControllerConfig* config,
                                    const std::string& test,
                                    MojoHandle handle,
                                    const char** arguments,
                                    int arguments_count,
                                    bool* unhandled_exception,
                                    char** error) {
@@ skipping 84 matching lines @@
 TEST_F(DartToCppTest, Echo) {
   EchoCppSideConnection cpp_side_connection;
   bool unhandled_exception =
       RunTest("dart_to_cpp_tests.dart", &cpp_side_connection);
   EXPECT_TRUE(cpp_side_connection.DidSucceed());
   EXPECT_FALSE(unhandled_exception);
 }
 
 }  // namespace dart
 }  // namespace mojo