Make 48 kHz maximum rate default for all devices

Bug: b/169918549
Change-Id: I2f4b7ced5ae6efcae3cd59c0a42610a54f5e2dc7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/203260
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33192}

modules/audio_processing/include/audio_processing.cc

diff --git a/modules/audio_processing/include/audio_processing.cc b/modules/audio_processing/include/audio_processing.cc
index 4af9b2f..e30ba69 100644
--- a/modules/audio_processing/include/audio_processing.cc
+++ b/modules/audio_processing/include/audio_processing.cc
@@ -57,14 +57,6 @@
   RTC_CHECK_NOTREACHED();
 }
 
-int GetDefaultMaxInternalRate() {
-#ifdef WEBRTC_ARCH_ARM_FAMILY
-  return 32000;
-#else
-  return 48000;
-#endif
-}
-
 }  // namespace
 
 constexpr int AudioProcessing::kNativeSampleRatesHz[];
@@ -72,9 +64,6 @@
 void CustomProcessing::SetRuntimeSetting(
     AudioProcessing::RuntimeSetting setting) {}
 
-AudioProcessing::Config::Pipeline::Pipeline()
-    : maximum_internal_processing_rate(GetDefaultMaxInternalRate()) {}
-
 bool Agc1Config::operator==(const Agc1Config& rhs) const {
   const auto& analog_lhs = analog_gain_controller;
   const auto& analog_rhs = rhs.analog_gain_controller;

modules/audio_processing/include/audio_processing.h

diff --git a/modules/audio_processing/include/audio_processing.h b/modules/audio_processing/include/audio_processing.h
index 1070a56..785a2b1 100644
--- a/modules/audio_processing/include/audio_processing.h
+++ b/modules/audio_processing/include/audio_processing.h
@@ -195,13 +195,9 @@
 
     // Sets the properties of the audio processing pipeline.
     struct RTC_EXPORT Pipeline {
-      Pipeline();
-
       // Maximum allowed processing rate used internally. May only be set to
-      // 32000 or 48000 and any differing values will be treated as 48000. The
-      // default rate is currently selected based on the CPU architecture, but
-      // that logic may change.
-      int maximum_internal_processing_rate;
+      // 32000 or 48000 and any differing values will be treated as 48000.
+      int maximum_internal_processing_rate = 48000;
       // Allow multi-channel processing of render audio.
       bool multi_channel_render = false;
       // Allow multi-channel processing of capture audio when AEC3 is active