Make binstubs run snapshots directly when possible.

sdk/lib/_internal/pub/test/global/binstubs/binstub_runs_precompiled_snapshot_test.dart

Index: sdk/lib/_internal/pub/test/global/binstubs/binstub_runs_precompiled_snapshot_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/binstubs/removes_when_deactivated_test.dart b/sdk/lib/_internal/pub/test/global/binstubs/binstub_runs_precompiled_snapshot_test.dart
similarity index 66%
copy from sdk/lib/_internal/pub/test/global/binstubs/removes_when_deactivated_test.dart
copy to sdk/lib/_internal/pub/test/global/binstubs/binstub_runs_precompiled_snapshot_test.dart
index 3a8e149c588a0abb056a3d4091105dfc803f9e82..cc2491155ebf24597df69bba625008864a0f3b0f 100644
--- a/sdk/lib/_internal/pub/test/global/binstubs/removes_when_deactivated_test.dart
+++ b/sdk/lib/_internal/pub/test/global/binstubs/binstub_runs_precompiled_snapshot_test.dart
@@ -9,28 +9,24 @@ import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration("removes binstubs when the package is deactivated", () {
+  integration("the binstubs runs a precompiled snapshot if present", () {
     servePackages((builder) {
       builder.serve("foo", "1.0.0", pubspec: {
         "executables": {
-          "one": null,
-          "two": null
+          "foo-script": "script"
         }
       }, contents: [
         d.dir("bin", [
-          d.file("one.dart", "main(args) => print('one');"),
-          d.file("two.dart", "main(args) => print('two');")
+          d.file("script.dart", "main(args) => print('ok');")
         ])
       ]);
     });
 
     schedulePub(args: ["global", "activate", "foo"]);
-    schedulePub(args: ["global", "deactivate", "foo"]);
 
     d.dir(cachePath, [
       d.dir("bin", [
-        d.nothing("one"),
-        d.nothing("two")
+        d.matcherFile("foo-script", contains("script.dart.snapshot"))
       ])
     ]).validate();
   });