stable null safety releases of test_core and test (#1424)

diff --git a/pkgs/test/CHANGELOG.md b/pkgs/test/CHANGELOG.md
index f98b827..2bcf3d6 100644
--- a/pkgs/test/CHANGELOG.md
+++ b/pkgs/test/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.16.0
+
+* Stable null safety release.
+
 ## 1.16.0-nullsafety.19
 
 * Use the `test_api` for stable null safety.
diff --git a/pkgs/test/pubspec.yaml b/pkgs/test/pubspec.yaml
index cdfd630..dc29722 100644
--- a/pkgs/test/pubspec.yaml
+++ b/pkgs/test/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 1.16.0-nullsafety.19
+version: 1.16.0
 description: A full featured library for writing and running Dart tests.
 homepage: https://github.com/dart-lang/test/blob/master/pkgs/test
 
@@ -13,26 +13,26 @@
   coverage: '>=0.13.4 <0.16.0'
   http_multi_server: ^2.0.0
   io: ^0.3.0
-  js: ^0.6.3-nullsafety
+  js: ^0.6.3
   node_preamble: ^1.3.0
   package_config: ">=1.9.0 <3.0.0"
   path: ^1.8.0
-  pedantic: ^1.10.0-nullsafety
-  pool: ^1.5.0-nullsafety
+  pedantic: ^1.10.0
+  pool: ^1.5.0
   shelf: '>=0.7.0 <2.0.0'
   shelf_packages_handler: ">=1.0.0 <3.0.0"
   shelf_static: ^0.2.6
   shelf_web_socket: ^0.2.0
   source_span: ^1.8.0
   stack_trace: ^1.10.0
-  stream_channel: ^2.1.0-nullsafety
-  typed_data: ^1.3.0-nullsafety
+  stream_channel: ^2.1.0
+  typed_data: ^1.3.0
   web_socket_channel: ^1.0.0
   webkit_inspection_protocol: ">=0.5.0 <0.8.0"
   yaml: ">=2.0.0 <4.0.0"
   # Use an exact version until the test_api and test_core package are stable.
   test_api: 0.2.19
-  test_core: 0.3.12-nullsafety.17
+  test_core: 0.3.12
 
 dev_dependencies:
   fake_async: ^1.0.0
diff --git a/pkgs/test_core/CHANGELOG.md b/pkgs/test_core/CHANGELOG.md
index 99296c9..580e98e 100644
--- a/pkgs/test_core/CHANGELOG.md
+++ b/pkgs/test_core/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.3.12
+
+* Stable null safety release.
+
 ## 0.3.12-nullsafety.17
 
 * Use the `test_api` for stable null safety.
diff --git a/pkgs/test_core/pubspec.yaml b/pkgs/test_core/pubspec.yaml
index 1a2504c..9d29f20 100644
--- a/pkgs/test_core/pubspec.yaml
+++ b/pkgs/test_core/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test_core
-version: 0.3.12-nullsafety.17
+version: 0.3.12
 description: A basic library for writing tests and running them on the VM.
 homepage: https://github.com/dart-lang/test/blob/master/pkgs/test_core
 
@@ -18,13 +18,13 @@
   meta: ^1.3.0
   package_config: ">=1.9.2 <3.0.0"
   path: ^1.8.0
-  pedantic: ^1.10.0-nullsafety
-  pool: ^1.5.0-nullsafety
-  source_map_stack_trace: ^2.1.0-nullsafety
-  source_maps: ^0.10.10-nullsafety
+  pedantic: ^1.10.0
+  pool: ^1.5.0
+  source_map_stack_trace: ^2.1.0
+  source_maps: ^0.10.10
   source_span: ^1.8.0
   stack_trace: ^1.10.0
-  stream_channel: ^2.1.0-nullsafety
+  stream_channel: ^2.1.0
   vm_service: '>=1.0.0 <7.0.0'
   yaml: ">=2.0.0 <4.0.0"
   # matcher is tightly constrained by test_api