Revert "Correct AEC3 multichannel functionality activation"

This reverts commit 9dda1b3a484ebeef921e419406402039f3852427.

Reason for revert: The CL is causing downstream issues

Original change's description:
> Correct AEC3 multichannel functionality activation
> 
> This CL corrects the AEC3 multichannel activation
> to also work for the case when a factory is used
> for the activation.
> 
> Bug: webrtc:10913
> Change-Id: Ic2807d8bcef759261fde14447cff30633ba248dc
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158794
> Commit-Queue: Per Åhgren <peah@webrtc.org>
> Reviewed-by: Sam Zackrisson <saza@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#29676}

TBR=saza@webrtc.org,peah@webrtc.org

Change-Id: Ic487f77f5c11485a0f25a2a1d3797d0ec956f913
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:10913
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158797
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29678}

api/audio/BUILD.gn

@@ -89,7 +89,4 @@ rtc_source_set("echo_control") {
   sources = [
     "echo_control.h",
   ]
-  deps = [
-    "../../rtc_base:checks",
-  ]
 }

api/audio/echo_canceller3_factory.cc

@@ -21,16 +21,9 @@ EchoCanceller3Factory::EchoCanceller3Factory(const EchoCanceller3Config& config)
     : config_(config) {}
 
 std::unique_ptr<EchoControl> EchoCanceller3Factory::Create(int sample_rate_hz) {
-  return Create(sample_rate_hz, /*num_render_channels=*/1,
+  return std::make_unique<EchoCanceller3>(config_, sample_rate_hz,
+                                          /*num_render_channels=*/1,
                                           /*num_capture_channels=*/1);
 }
 
-std::unique_ptr<EchoControl> EchoCanceller3Factory::Create(
-    int sample_rate_hz,
-    int num_render_channels,
-    int num_capture_channels) {
-  return std::make_unique<EchoCanceller3>(
-      config_, sample_rate_hz, num_render_channels, num_capture_channels);
-}
-
 }  // namespace webrtc

api/audio/echo_canceller3_factory.h

@@ -29,15 +29,9 @@ class RTC_EXPORT EchoCanceller3Factory : public EchoControlFactory {
   explicit EchoCanceller3Factory(const EchoCanceller3Config& config);
 
   // Creates an EchoCanceller3 running at the specified sampling rate using a
-  // mono setup.
+  // mono setup
   std::unique_ptr<EchoControl> Create(int sample_rate_hz) override;
 
-  // Creates an EchoCanceller3 running at the specified sampling rate using a
-  // multichannel setup.
-  std::unique_ptr<EchoControl> Create(int sample_rate_hz,
-                                      int num_render_channels,
-                                      int num_capture_channels) override;
-
  private:
   const EchoCanceller3Config config_;
 };

api/audio/echo_control.h

@@ -13,8 +13,6 @@
 
 #include <memory>
 
-#include "rtc_base/checks.h"
-
 namespace webrtc {
 
 class AudioBuffer;
@@ -53,14 +51,6 @@ class EchoControl {
 class EchoControlFactory {
  public:
   virtual std::unique_ptr<EchoControl> Create(int sample_rate_hz) = 0;
-  // TODO(peah): Make pure virtual.
-  virtual std::unique_ptr<EchoControl> Create(int sample_rate_hz,
-                                              int num_render_channels,
-                                              int num_capture_channels) {
-    RTC_NOTREACHED();
-    return nullptr;
-  }
-
   virtual ~EchoControlFactory() = default;
 };
 }  // namespace webrtc

modules/audio_processing/audio_processing_impl.cc

@@ -1783,8 +1783,8 @@ void AudioProcessingImpl::InitializeEchoController() {
   if (use_echo_controller) {
     // Create and activate the echo controller.
     if (echo_control_factory_) {
-      submodules_.echo_controller = echo_control_factory_->Create(
-          proc_sample_rate_hz(), num_reverse_channels(), num_proc_channels());
+      submodules_.echo_controller =
+          echo_control_factory_->Create(proc_sample_rate_hz());
     } else {
       submodules_.echo_controller = std::make_unique<EchoCanceller3>(
           EchoCanceller3Config(), proc_sample_rate_hz(), num_reverse_channels(),

modules/audio_processing/audio_processing_impl_unittest.cc

@@ -54,12 +54,6 @@ class MockEchoControlFactory : public EchoControlFactory {
   // Returns a pointer to the next MockEchoControl that this factory creates.
   MockEchoControl* GetNext() const { return next_mock_.get(); }
   std::unique_ptr<EchoControl> Create(int sample_rate_hz) override {
-    RTC_NOTREACHED();
-    return nullptr;
-  }
-  std::unique_ptr<EchoControl> Create(int sample_rate_hz,
-                                      int num_render_channels,
-                                      int num_capture_channels) override {
     std::unique_ptr<EchoControl> mock = std::move(next_mock_);
     next_mock_ = std::make_unique<MockEchoControl>();
     return mock;

modules/audio_processing/audio_processing_unittest.cc

@@ -2430,8 +2430,8 @@ class MyEchoControlFactory : public EchoControlFactory {
   }
 
   std::unique_ptr<EchoControl> Create(int sample_rate_hz,
-                                      int num_render_channels,
-                                      int num_capture_channels) {
+                                      size_t num_render_channels,
+                                      size_t num_capture_channels) {
     return Create(sample_rate_hz);
   }
 };