NackModule2: Rename to NackRequester.

The alternative new name proposed, NackTracker, is already in
use in audio_coding.

Fixed: webrtc:11594
Change-Id: I6a05fafc05fa7ddb18ea4f64886a135e5ef59f7e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226744
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Markus Handell <handellm@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34539}
diff --git a/modules/video_coding/BUILD.gn b/modules/video_coding/BUILD.gn
index d88ce42..2ffee9e 100644
--- a/modules/video_coding/BUILD.gn
+++ b/modules/video_coding/BUILD.gn
@@ -71,12 +71,12 @@
   ]
 }
 
-rtc_library("nack_module") {
+rtc_library("nack_requester") {
   sources = [
     "histogram.cc",
     "histogram.h",
-    "nack_module2.cc",
-    "nack_module2.h",
+    "nack_requester.cc",
+    "nack_requester.h",
   ]
 
   deps = [
@@ -965,8 +965,8 @@
       "jitter_buffer_unittest.cc",
       "jitter_estimator_tests.cc",
       "loss_notification_controller_unittest.cc",
-      "nack_module2_unittest.cc",
       "nack_module_unittest.cc",
+      "nack_requester_unittest.cc",
       "packet_buffer_unittest.cc",
       "receiver_unittest.cc",
       "rtp_frame_reference_finder_unittest.cc",
@@ -1002,7 +1002,7 @@
       ":codec_globals_headers",
       ":encoded_frame",
       ":frame_dependencies_calculator",
-      ":nack_module",
+      ":nack_requester",
       ":simulcast_test_fixture_impl",
       ":video_codec_interface",
       ":video_codecs_test_framework",