Convert //media/filters from scoped_ptr to std::unique_ptr

BUG=554298
R=ddorwin@chromium.org

Review URL: https://codereview.chromium.org/1904213003

Cr-Commit-Position: refs/heads/master@{#388991}

diff --git a/media/filters/decrypting_audio_decoder_unittest.cc b/media/filters/decrypting_audio_decoder_unittest.cc
index 81f2504..4b9784e 100644
--- a/media/filters/decrypting_audio_decoder_unittest.cc
+++ b/media/filters/decrypting_audio_decoder_unittest.cc

@@ -43,7 +43,7 @@
 static scoped_refptr<DecoderBuffer> CreateFakeEncryptedBuffer() {
   const int buffer_size = 16;  // Need a non-empty buffer;
   scoped_refptr<DecoderBuffer> buffer(new DecoderBuffer(buffer_size));
-  buffer->set_decrypt_config(scoped_ptr<DecryptConfig>(new DecryptConfig(
+  buffer->set_decrypt_config(std::unique_ptr<DecryptConfig>(new DecryptConfig(
       std::string(reinterpret_cast<const char*>(kFakeKeyId),
                   arraysize(kFakeKeyId)),
       std::string(reinterpret_cast<const char*>(kFakeIv), arraysize(kFakeIv)),
@@ -256,9 +256,9 @@
   MOCK_METHOD0(OnWaitingForDecryptionKey, void(void));
 
   base::MessageLoop message_loop_;
-  scoped_ptr<DecryptingAudioDecoder> decoder_;
-  scoped_ptr<StrictMock<MockCdmContext>> cdm_context_;
-  scoped_ptr<StrictMock<MockDecryptor>> decryptor_;
+  std::unique_ptr<DecryptingAudioDecoder> decoder_;
+  std::unique_ptr<StrictMock<MockCdmContext>> cdm_context_;
+  std::unique_ptr<StrictMock<MockDecryptor>> decryptor_;
   AudioDecoderConfig config_;
 
   // Variables to help the |decryptor_| to simulate decoding delay and flushing.