AGC: Removing unnneccessary copying and changing to using const

The changes have been shown to be bitexact on a large dataset.

Bug: webrtc:10859
Change-Id: Iedc0e9e944ebfabb717dd7fb4d2682c695da883e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/159694
Reviewed-by: Benjamin Wright <benwright@webrtc.org>
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Commit-Queue: Benjamin Wright <benwright@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29883}
diff --git a/modules/audio_processing/audio_processing_unittest.cc b/modules/audio_processing/audio_processing_unittest.cc
index 0e17db7..199f378 100644
--- a/modules/audio_processing/audio_processing_unittest.cc
+++ b/modules/audio_processing/audio_processing_unittest.cc
@@ -2102,7 +2102,7 @@
                       std::make_tuple(32000, 16000, 32000, 16000, 25, 20),
                       std::make_tuple(32000, 16000, 16000, 16000, 25, 0),
 
-                      std::make_tuple(16000, 48000, 48000, 48000, 24, 0),
+                      std::make_tuple(16000, 48000, 48000, 48000, 23, 0),
                       std::make_tuple(16000, 48000, 32000, 48000, 24, 30),
                       std::make_tuple(16000, 48000, 16000, 48000, 24, 20),
                       std::make_tuple(16000, 44100, 48000, 44100, 15, 20),
@@ -2145,30 +2145,30 @@
                       std::make_tuple(44100, 16000, 32000, 16000, 19, 20),
                       std::make_tuple(44100, 16000, 16000, 16000, 19, 0),
 
-                      std::make_tuple(32000, 48000, 48000, 48000, 28, 0),
+                      std::make_tuple(32000, 48000, 48000, 48000, 27, 0),
                       std::make_tuple(32000, 48000, 32000, 48000, 65, 30),
                       std::make_tuple(32000, 48000, 16000, 48000, 30, 20),
                       std::make_tuple(32000, 44100, 48000, 44100, 20, 20),
                       std::make_tuple(32000, 44100, 32000, 44100, 20, 15),
                       std::make_tuple(32000, 44100, 16000, 44100, 20, 15),
-                      std::make_tuple(32000, 32000, 48000, 32000, 29, 35),
+                      std::make_tuple(32000, 32000, 48000, 32000, 27, 35),
                       std::make_tuple(32000, 32000, 32000, 32000, 0, 0),
-                      std::make_tuple(32000, 32000, 16000, 32000, 32, 20),
+                      std::make_tuple(32000, 32000, 16000, 32000, 30, 20),
                       std::make_tuple(32000, 16000, 48000, 16000, 20, 20),
                       std::make_tuple(32000, 16000, 32000, 16000, 20, 20),
                       std::make_tuple(32000, 16000, 16000, 16000, 20, 0),
 
-                      std::make_tuple(16000, 48000, 48000, 48000, 24, 0),
-                      std::make_tuple(16000, 48000, 32000, 48000, 25, 30),
+                      std::make_tuple(16000, 48000, 48000, 48000, 23, 0),
+                      std::make_tuple(16000, 48000, 32000, 48000, 24, 30),
                       std::make_tuple(16000, 48000, 16000, 48000, 25, 20),
                       std::make_tuple(16000, 44100, 48000, 44100, 15, 20),
                       std::make_tuple(16000, 44100, 32000, 44100, 15, 15),
                       std::make_tuple(16000, 44100, 16000, 44100, 15, 15),
                       std::make_tuple(16000, 32000, 48000, 32000, 24, 35),
-                      std::make_tuple(16000, 32000, 32000, 32000, 25, 0),
+                      std::make_tuple(16000, 32000, 32000, 32000, 24, 0),
                       std::make_tuple(16000, 32000, 16000, 32000, 25, 20),
-                      std::make_tuple(16000, 16000, 48000, 16000, 30, 20),
-                      std::make_tuple(16000, 16000, 32000, 16000, 30, 20),
+                      std::make_tuple(16000, 16000, 48000, 16000, 28, 20),
+                      std::make_tuple(16000, 16000, 32000, 16000, 28, 20),
                       std::make_tuple(16000, 16000, 16000, 16000, 0, 0)));
 #endif