Support Git in pub global activate.

sdk/lib/_internal/pub/test/global/activate/missing_git_repo_test.dart

Index: sdk/lib/_internal/pub/test/global/activate/missing_git_repo_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/run/unknown_package_test.dart b/sdk/lib/_internal/pub/test/global/activate/missing_git_repo_test.dart
similarity index 54%
copy from sdk/lib/_internal/pub/test/global/run/unknown_package_test.dart
copy to sdk/lib/_internal/pub/test/global/activate/missing_git_repo_test.dart
index e5a4bab07184a447763a5b0a93b311f84f84551a..6b840b8fb0b7d8bff2a699f2d1ae1d44422de924 100644
--- a/sdk/lib/_internal/pub/test/global/run/unknown_package_test.dart
+++ b/sdk/lib/_internal/pub/test/global/activate/missing_git_repo_test.dart
@@ -4,16 +4,15 @@
 
 import 'package:scheduled_test/scheduled_test.dart';
 
-import '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration('errors if the package is not activated', () {
-    servePackages([]);
+  integration('fails if the Git repo does not exist', () {
+    ensureGit();
 
-    schedulePub(args: ["global", "run", "foo:bar"],
-        error: startsWith("No active package foo."),
-        exitCode: exit_codes.DATA);
+    schedulePub(args: ["global", "activate", "-sgit", "../nope.git"],
+        error: contains("repository '../nope.git' does not exist"),
+        exitCode: 1);
   });
 }