Revert "IWYU: Add <cmath> for fabsf() and powf(), switch to C++ versions"

This reverts commit e90879097c7151148aaad57393967cf72d233a69.

Reason for revert: breaking downstream projects

Original change's description:
> IWYU: Add <cmath> for fabsf() and powf(), switch to C++ versions
> 
> Fix the build with libstdc++ after 496cedfe5 ("AEC3: Reverberation model:
> Changes on the decay estimation") by including the missing header:
> 
>     ../../modules/audio_processing/aec3/reverb_model_estimator.cc: In constructor ‘webrtc::ReverbModelEstimator::ReverbModelEstimator(const webrtc::EchoCanceller3Config&)’:
>     ../../modules/audio_processing/aec3/reverb_model_estimator.cc:61:21: error: ‘fabsf’ was not declared in this scope
>            reverb_decay_(fabsf(config.ep_strength.default_len)),
>                          ^~~~~
>     ../../modules/audio_processing/aec3/reverb_model_estimator.cc:61:21: note: suggested alternative: ‘labs’
>            reverb_decay_(fabsf(config.ep_strength.default_len)),
>                          ^~~~~
>                          labs
>     ../../modules/audio_processing/aec3/reverb_model_estimator.cc: In member function ‘void webrtc::ReverbModelEstimator::UpdateReverbDecay(const std::vector<float>&)’:
>     ../../modules/audio_processing/aec3/reverb_model_estimator.cc:206:15: error: ‘powf’ was not declared in this scope
>            decay = powf(2.0f, -exp_candidate * kFftLengthBy2);
>                    ^~~~
> 
> While here, also switch to the C++ versions of those functions: std::fabs()
> and std::pow() respectively.
> 
> Spotted by Jose Dapena Paz <jose.dapena@lge.com>.
> 
> Bug: chromium:819294
> Change-Id: Id803243be8dd17eac95c70a88a37ee2fe1505a5a
> Reviewed-on: https://webrtc-review.googlesource.com/87421
> Reviewed-by: Jesus de Vicente Pena <devicentepena@webrtc.org>
> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
> Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#23870}

TBR=gustaf@webrtc.org,alessiob@webrtc.org,raphael.kubo.da.costa@intel.com,devicentepena@webrtc.org

Change-Id: I22423a2d4201183f70ae084e0e21930367824f1c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:819294
Reviewed-on: https://webrtc-review.googlesource.com/87401
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23871}
diff --git a/modules/audio_processing/aec3/reverb_model_estimator.cc b/modules/audio_processing/aec3/reverb_model_estimator.cc
index 84e8e48..18b2a84 100644
--- a/modules/audio_processing/aec3/reverb_model_estimator.cc
+++ b/modules/audio_processing/aec3/reverb_model_estimator.cc
@@ -12,7 +12,6 @@
 
 #include <algorithm>
 #include <array>
-#include <cmath>
 #include <memory>
 #include <numeric>
 
@@ -59,7 +58,7 @@
 
 ReverbModelEstimator::ReverbModelEstimator(const EchoCanceller3Config& config)
     : filter_main_length_blocks_(config.filter.main.length_blocks),
-      reverb_decay_(std::fabs(config.ep_strength.default_len)),
+      reverb_decay_(fabsf(config.ep_strength.default_len)),
       enable_smooth_freq_resp_tail_updates_(EnableSmoothUpdatesTailFreqResp()) {
   block_energies_.fill(0.f);
   freq_resp_tail_.fill(0.f);
@@ -204,7 +203,7 @@
 
     if (accumulated_nn_ != 0.f) {
       const float exp_candidate = -accumulated_nz_ / accumulated_nn_;
-      decay = std::pow(2.0f, -exp_candidate * kFftLengthBy2);
+      decay = powf(2.0f, -exp_candidate * kFftLengthBy2);
       decay = std::min(decay, kMaxDecay);
       decay = std::max(decay, kMinDecay);
     }