Correct/update the activation of the multi-channel processing in APM

This CL removes the experimental status of the multi-channel processing
in APM, and accordingly updates the variable naming.

It also splits the activation of multi-channel processing to be separate
for render and capture.


Bug: webrtc:10859
Change-Id: I0e5d04dcb94b6637c33d97146231b8ddddbaea39
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/160707
Commit-Queue: Per Åhgren <peah@webrtc.org>
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29926}
diff --git a/modules/audio_processing/audio_processing_impl.h b/modules/audio_processing/audio_processing_impl.h
index 61bf151..5f1d12f 100644
--- a/modules/audio_processing/audio_processing_impl.h
+++ b/modules/audio_processing/audio_processing_impl.h
@@ -374,8 +374,8 @@
                  bool use_experimental_agc,
                  bool use_experimental_agc_agc2_level_estimation,
                  bool use_experimental_agc_agc2_digital_adaptive,
-                 bool experimental_multi_channel_render_support,
-                 bool experimental_multi_channel_capture_support)
+                 bool multi_channel_render_support,
+                 bool multi_channel_capture_support)
         : agc_startup_min_volume(agc_startup_min_volume),
           agc_clipped_level_min(agc_clipped_level_min),
           use_experimental_agc(use_experimental_agc),
@@ -383,17 +383,15 @@
               use_experimental_agc_agc2_level_estimation),
           use_experimental_agc_agc2_digital_adaptive(
               use_experimental_agc_agc2_digital_adaptive),
-          experimental_multi_channel_render_support(
-              experimental_multi_channel_render_support),
-          experimental_multi_channel_capture_support(
-              experimental_multi_channel_capture_support) {}
+          multi_channel_render_support(multi_channel_render_support),
+          multi_channel_capture_support(multi_channel_capture_support) {}
     int agc_startup_min_volume;
     int agc_clipped_level_min;
     bool use_experimental_agc;
     bool use_experimental_agc_agc2_level_estimation;
     bool use_experimental_agc_agc2_digital_adaptive;
-    bool experimental_multi_channel_render_support;
-    bool experimental_multi_channel_capture_support;
+    bool multi_channel_render_support;
+    bool multi_channel_capture_support;
   } constants_;
 
   struct ApmCaptureState {