Don't try to preserve version of active package.

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

Index: sdk/lib/_internal/pub/test/global/activate/ignores_active_version_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/activate/same_version_test.dart b/sdk/lib/_internal/pub/test/global/activate/ignores_active_version_test.dart
similarity index 78%
rename from sdk/lib/_internal/pub/test/global/activate/same_version_test.dart
rename to sdk/lib/_internal/pub/test/global/activate/ignores_active_version_test.dart
index 3d0209837b147f0c1e520b5f720b9f791d752287..36508558add05dc1db99f9299355c5ef088e432c 100644
--- a/sdk/lib/_internal/pub/test/global/activate/same_version_test.dart
+++ b/sdk/lib/_internal/pub/test/global/activate/ignores_active_version_test.dart
@@ -6,7 +6,7 @@ import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration('keeps previously activated version if it meets the constraint',
+  integration('ignores previously activated version',
         () {
     servePackages([
       packageMap("foo", "1.2.3"),
@@ -16,10 +16,11 @@ main() {
     // Activate 1.2.3.
     schedulePub(args: ["global", "activate", "foo", "1.2.3"]);
 
-    // Activating it again re-resolves but maintains the version.
+    // Activating it again resolves to the new best version.
     schedulePub(args: ["global", "activate", "foo", ">1.0.0"], output: """
 Package foo is currently active at version 1.2.3.
+Downloading foo 1.3.0...
 Resolving dependencies...
-Activated foo 1.2.3.""");
+Activated foo 1.3.0.""");
   });
 }