Use ScopedTaskEnvironment instead of MessageLoop in media unit tests.

media/cdm/aes_decryptor_unittest.cc

 // Copyright 2013 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 "media/cdm/aes_decryptor.h"
 
 #include <stdint.h>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/debug/leak_annotations.h"
 #include "base/json/json_reader.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/values.h"
 #include "media/base/cdm_callback_promise.h"
 #include "media/base/cdm_config.h"
 #include "media/base/cdm_key_information.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/decrypt_config.h"
 #include "media/base/decryptor.h"
 #include "media/base/mock_filters.h"
 #include "media/cdm/api/content_decryption_module.h"
 #include "media/cdm/cdm_adapter.h"
@@ skipping 431 matching lines @@
 
   StrictMock<MockCdmClient> cdm_client_;
   scoped_refptr<ContentDecryptionModule> cdm_;
   Decryptor* decryptor_;
   Decryptor::DecryptCB decrypt_cb_;
   std::string session_id_;
 
   // Helper class to load/unload External Clear Key Library, if necessary.
   std::unique_ptr<ExternalClearKeyTestHelper> helper_;
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
 
   // Constants for testing.
   const std::vector<uint8_t> original_data_;
   const std::vector<uint8_t> encrypted_data_;
   const std::vector<uint8_t> subsample_encrypted_data_;
   const std::vector<uint8_t> key_id_;
   const std::vector<uint8_t> iv_;
   const std::vector<SubsampleEntry> normal_subsample_entries_;
   const std::vector<SubsampleEntry> no_subsample_entries_;
 };
@@ skipping 544 matching lines @@
 INSTANTIATE_TEST_CASE_P(CdmAdapter,
                         AesDecryptorTest,
                         testing::Values("CdmAdapter"));
 #endif
 
 // TODO(jrummell): Once MojoCdm/MojoCdmService/MojoDecryptor/
 // MojoDecryptorService are implemented, add a third version that tests the
 // CDM via mojo.
 
 }  // namespace media