Revert "Reland of https://webrtc-review.googlesource.com/c/src/+/114883"

This reverts commit 5341aaccdb64e3336abf5875e8828222446adffa.

Reason for revert: Order of initialization of global static strings.

Original change's description:
> Reland of https://webrtc-review.googlesource.com/c/src/+/114883
> 
> The difference to the original is new bitexactness strings AND
> global static file string constants. The reason for reland is breaking
> downstream projects.
> 
> Original CL description:
> 
> Tests for multi-stream Opus.
> 
> This CL (mainly) adds bit-exactness tests for multi-stream Opus. The
> tests are in audio_coding_unittest.cc. Some refactoring of
> AcmSendTestOldApi, AcmSenderBitExactnessOldApi is done to make it
> possible. A few checks for "channels \in {1, 2}" are replaced with
> "channels \in {1, 2, 4, 6, 8}" in the WebRTC Opus codec wrapper. A few
> other changes are made to be able to write and read multi-channel WAV
> files.
> 
> The SDP changes are NOT included; as of this CL there is no way to set
> up a multi-stream opus en/de-coder from SDP strings.
> 
> Bug: webrtc:8649
> Change-Id: I9fd47c790c241c1876c4a731b0840bec30b4f1b2
> Reviewed-on: https://webrtc-review.googlesource.com/c/123387
> Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
> Commit-Queue: Alex Loiko <aleloi@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#26774}

TBR=aleloi@webrtc.org,ossu@webrtc.org

Change-Id: I88060f2050ccee83d6091b042a10f79b3c4edc47
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:8649
Reviewed-on: https://webrtc-review.googlesource.com/c/123580
Reviewed-by: Alex Loiko <aleloi@webrtc.org>
Commit-Queue: Alex Loiko <aleloi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26777}
diff --git a/modules/audio_coding/acm2/acm_send_test.cc b/modules/audio_coding/acm2/acm_send_test.cc
index b6110b6..98d673f 100644
--- a/modules/audio_coding/acm2/acm_send_test.cc
+++ b/modules/audio_coding/acm2/acm_send_test.cc
@@ -106,9 +106,13 @@
   // Insert audio and process until one packet is produced.
   while (clock_.TimeInMilliseconds() < test_duration_ms_) {
     clock_.AdvanceTimeMilliseconds(kBlockSizeMs);
-    RTC_CHECK(audio_source_->Read(
-        input_block_size_samples_ * input_frame_.num_channels_,
-        input_frame_.mutable_data()));
+    RTC_CHECK(audio_source_->Read(input_block_size_samples_,
+                                  input_frame_.mutable_data()));
+    if (input_frame_.num_channels_ > 1) {
+      InputAudioFile::DuplicateInterleaved(
+          input_frame_.data(), input_block_size_samples_,
+          input_frame_.num_channels_, input_frame_.mutable_data());
+    }
     data_to_send_ = false;
     RTC_CHECK_GE(acm_->Add10MsData(input_frame_), 0);
     input_frame_.timestamp_ += static_cast<uint32_t>(input_block_size_samples_);