Revert "Revert "GN rtc_* templates: Set default visibility to webrtc_root + "/*"""

This reverts commit c73e1f437889d882cbf2987f7fb3a029a6150613.

Reason for revert: 
The problem with failed deps in chrome content/renderer had already been fixed in https://webrtc-review.googlesource.com/c/src/+/38660

Original change's description:
> Revert "GN rtc_* templates: Set default visibility to webrtc_root + "/*""
> 
> This reverts commit 588c548657b3ddf76e7b3f241263eef7f5799f16.
> 
> Reason for revert: 
> 
> Breaks Chrome FYI:
> 
> /b/c/b/Linux_Builder/src/buildtools/linux64/gn gen //out/Release --check
>   -> returned 1
> ERROR at //build/split_static_library.gni:12:5: Dependency not allowed.
>     static_library(target_name) {
>     ^----------------------------
> The item //content/renderer:renderer
> can not depend on //third_party/webrtc/media:rtc_internal_video_codecs
> because it is not in //third_party/webrtc/media:rtc_internal_video_codecs's visibility list: [
>   //third_party/webrtc/*
>   //third_party/webrtc_overrides/*
> ]
> 
>  https://logs.chromium.org/v/?s=chromium%2Fbb%2Fchromium.webrtc.fyi%2FLinux_Builder%2F23560%2F%2B%2Frecipes%2Fsteps%2Fgenerate_build_files%2F0%2Fstdout
> 
> Original change's description:
> > GN rtc_* templates: Set default visibility to webrtc_root + "/*"
> > 
> > This means that by default, targets are visible to everything under
> > the WebRTC root, but not visible to anything else.
> > 
> > API targets are manually tagged with visibility "*", so that targets
> > outside the WebRTC tree can see them.
> > 
> > BUG=webrtc:8254
> > 
> > Change-Id: Icdbee6e0d22d93240ff2fb530c8f9dc48e351509
> > Reviewed-on: https://webrtc-review.googlesource.com/24140
> > Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
> > Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#21548}
> 
> TBR=mbonadei@webrtc.org,kwiberg@webrtc.org
> 
> Change-Id: I06620ce3d6f67482935c22efa231dd6cab91625a
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: webrtc:8254
> Reviewed-on: https://webrtc-review.googlesource.com/38760
> Reviewed-by: Per Kjellander <perkj@webrtc.org>
> Commit-Queue: Per Kjellander <perkj@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#21555}

TBR=mbonadei@webrtc.org,kwiberg@webrtc.org,perkj@webrtc.org

Change-Id: I6f720078ce21bd172e0a6471bae8c4c011e4a657
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:8254
Reviewed-on: https://webrtc-review.googlesource.com/38860
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21558}
diff --git a/modules/audio_coding/BUILD.gn b/modules/audio_coding/BUILD.gn
index 1d6a70c8..f9eea0c 100644
--- a/modules/audio_coding/BUILD.gn
+++ b/modules/audio_coding/BUILD.gn
@@ -40,7 +40,7 @@
                     ]
 
 rtc_static_library("audio_format_conversion") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "codecs/audio_format_conversion.cc",
     "codecs/audio_format_conversion.h",
@@ -57,7 +57,7 @@
 }
 
 rtc_static_library("rent_a_codec") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "acm2/acm_codec_database.cc",
     "acm2/acm_codec_database.h",
@@ -297,7 +297,7 @@
 }
 
 rtc_static_library("ilbc") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "codecs/ilbc/audio_decoder_ilbc.cc",
     "codecs/ilbc/audio_decoder_ilbc.h",
@@ -823,7 +823,7 @@
 }
 
 rtc_static_library("webrtc_opus") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "codecs/opus/audio_decoder_opus.cc",
     "codecs/opus/audio_decoder_opus.h",
@@ -884,7 +884,7 @@
 
 if (rtc_enable_protobuf) {
   proto_library("ana_debug_dump_proto") {
-    visibility += [ "*" ]
+    visibility += webrtc_default_visibility
     sources = [
       "audio_network_adaptor/debug_dump.proto",
     ]
@@ -902,7 +902,7 @@
 }
 
 rtc_static_library("audio_network_adaptor_config") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "audio_network_adaptor/audio_network_adaptor_config.cc",
     "audio_network_adaptor/include/audio_network_adaptor_config.h",
@@ -913,7 +913,7 @@
 }
 
 rtc_static_library("audio_network_adaptor") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "audio_network_adaptor/audio_network_adaptor_impl.cc",
     "audio_network_adaptor/audio_network_adaptor_impl.h",
@@ -984,7 +984,7 @@
 }
 
 rtc_static_library("neteq") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "neteq/accelerate.cc",
     "neteq/accelerate.h",
@@ -1082,7 +1082,7 @@
 # that ultimately are built and run as a part of the Chromium ecosystem, which
 # does not set the rtc_include_tests flag.
 rtc_source_set("neteq_tools_minimal") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "neteq/tools/audio_sink.cc",
     "neteq/tools/audio_sink.h",
@@ -1119,7 +1119,7 @@
 }
 
 rtc_source_set("neteq_test_tools") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   testonly = true
   sources = [
     "neteq/tools/audio_checksum.h",
@@ -1178,7 +1178,7 @@
 }
 
 rtc_source_set("neteq_tools") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "neteq/tools/fake_decode_from_file.cc",
     "neteq/tools/fake_decode_from_file.h",
@@ -1214,7 +1214,7 @@
 }
 
 rtc_source_set("neteq_input_audio_tools") {
-  visibility += [ "*" ]
+  visibility += webrtc_default_visibility
   sources = [
     "neteq/tools/input_audio_file.cc",
     "neteq/tools/input_audio_file.h",
@@ -1275,7 +1275,7 @@
   }
 
   group("audio_coding_tests") {
-    visibility += [ "*" ]
+    visibility += webrtc_default_visibility
     testonly = true
     public_deps = [
       ":acm_receive_test",
@@ -1310,7 +1310,7 @@
 
   rtc_source_set("audio_coding_modules_tests") {
     testonly = true
-    visibility += [ "*" ]
+    visibility += webrtc_default_visibility
 
     sources = [
       "test/ACMTest.h",
@@ -1374,7 +1374,7 @@
 
   rtc_source_set("audio_coding_perf_tests") {
     testonly = true
-    visibility += [ "*" ]
+    visibility += webrtc_default_visibility
 
     sources = [
       "codecs/opus/opus_complexity_unittest.cc",
@@ -2053,7 +2053,7 @@
 
   rtc_source_set("audio_coding_unittests") {
     testonly = true
-    visibility += [ "*" ]
+    visibility += webrtc_default_visibility
 
     sources = [
       "acm2/acm_receiver_unittest.cc",