Migrate base::{size,empty,data} to STL equivalents in //media.

Bug: 1299695
Change-Id: I46db5f3dad717a0bd980ed7cd57d1225b9d9e83d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3493022
Reviewed-by: Lei Zhang <thestig@chromium.org>
Owners-Override: Lei Zhang <thestig@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#975679}

diff --git a/media/filters/decrypting_audio_decoder_unittest.cc b/media/filters/decrypting_audio_decoder_unittest.cc
index 0774de1..704299b 100644
--- a/media/filters/decrypting_audio_decoder_unittest.cc
+++ b/media/filters/decrypting_audio_decoder_unittest.cc

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "media/filters/decrypting_audio_decoder.h"
+
 #include <stdint.h>
 
 #include <string>
@@ -9,7 +11,6 @@
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
-#include "base/cxx17_backports.h"
 #include "base/run_loop.h"
 #include "base/test/gmock_callback_support.h"
 #include "base/test/gmock_move_support.h"
@@ -21,7 +22,6 @@
 #include "media/base/mock_filters.h"
 #include "media/base/test_helpers.h"
 #include "media/base/timestamp_constants.h"
-#include "media/filters/decrypting_audio_decoder.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using ::base::test::RunOnceCallback;
@@ -47,8 +47,8 @@
   scoped_refptr<DecoderBuffer> buffer(new DecoderBuffer(buffer_size));
   buffer->set_decrypt_config(DecryptConfig::CreateCencConfig(
       std::string(reinterpret_cast<const char*>(kFakeKeyId),
-                  base::size(kFakeKeyId)),
-      std::string(reinterpret_cast<const char*>(kFakeIv), base::size(kFakeIv)),
+                  std::size(kFakeKeyId)),
+      std::string(reinterpret_cast<const char*>(kFakeIv), std::size(kFakeIv)),
       std::vector<SubsampleEntry>()));
   return buffer;
 }