Revert "Reland "Roll the latest args package into the SDK repo.""

This reverts commit f9bb05a.

Reason for revert: We discovered more breakage in google3: http://b/174613423#comment14

Original change's description:
> Reland "Roll the latest args package into the SDK repo."
>
> This is a reland of 9906fab
>
> Original change's description:
> > Roll the latest args package into the SDK repo.
> >
> > Change-Id: Ie464e5c01f34a101103d16ff108b6b9eb80fbd4b
> > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/174485
> > Reviewed-by: Nate Bosch <[email protected]>
> > Commit-Queue: Bob Nystrom <[email protected]>
> > Auto-Submit: Bob Nystrom <[email protected]>
>
> Change-Id: I5b7b041e02857114c257393cf9d560b6b8b03fd5
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/174701
> Reviewed-by: Daco Harkes <[email protected]>
> Reviewed-by: Martin Kustermann <[email protected]>
> Commit-Queue: Tess Strickland <[email protected]>

[email protected],[email protected],[email protected],[email protected],[email protected]

Change-Id: Ie47133a25e86e36b0eecdbb3da7abc1388816b71
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/174921
Reviewed-by: Michal Terepeta <[email protected]>
Reviewed-by: David Morgan <[email protected]>
Reviewed-by: Tess Strickland <[email protected]>
Commit-Queue: Tess Strickland <[email protected]>
Commit-Queue: Michal Terepeta <[email protected]>

Author: michalt

.dart_tool/package_config.json

@@ -11,7 +11,7 @@
     "constraint, update this by running tools/generate_package_config.dart."
   ],
   "configVersion": 2,
-  "generated": "2020-11-30T16:23:50.740805",
+  "generated": "2020-11-15T14:18:10.587065",
   "generator": "tools/generate_package_config.dart",
   "packages": [
     {
@@ -101,7 +101,7 @@
       "name": "args",
       "rootUri": "../third_party/pkg/args",
       "packageUri": "lib/",
-      "languageVersion": "2.12"
+      "languageVersion": "2.3"
     },
     {
       "name": "async",

DEPS

@@ -68,7 +68,7 @@ vars = {
   "gperftools_revision": "180bfa10d7cb38e8b3784d60943d50e8fcef0dcb",
 
   # Revisions of /third_party/* dependencies.
-  "args_rev": "139140125126661fac88c9aa5882165936d01c91",
+  "args_tag": "1.6.0",
   "async_rev": "695b3ac280f107c84adf7488743abfdfaaeea68f",
   "bazel_worker_rev": "060c55a933d39798681a4f533b161b81dc48d77e",
   "benchmark_harness_rev": "ec6b646f5443faa871e126ac1ba248c94ca06257",
@@ -301,7 +301,7 @@ deps = {
       "@" + Var("gperftools_revision"),
 
   Var("dart_root") + "/third_party/pkg/args":
-      Var("dart_git") + "args.git" + "@" + Var("args_rev"),
+      Var("dart_git") + "args.git" + "@" + Var("args_tag"),
   Var("dart_root") + "/third_party/pkg/async":
       Var("dart_git") + "async.git" + "@" + Var("async_rev"),
   Var("dart_root") + "/third_party/pkg/bazel_worker":

pkg/native_stack_traces/bin/decode.dart

@@ -300,12 +300,12 @@ Future<void> main(List<String> arguments) async {
   if (options['help']) return print(_usages[options.command?.name]);
   if (options.command == null) return errorWithUsage('no command provided');
 
-  switch (options.command!.name) {
+  switch (options.command.name) {
     case 'help':
-      return help(options.command!);
+      return help(options.command);
     case 'find':
-      return find(options.command!);
+      return find(options.command);
     case 'translate':
-      return await translate(options.command!);
+      return await translate(options.command);
   }
 }