Remove a pointless nested set expansion.

Change-Id: Icdabf559303bfac459e1a88ff44ca95298574361

Closes #5333.

Change-Id: Icdabf559303bfac459e1a88ff44ca95298574361
PiperOrigin-RevId: 199527673
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/Runfiles.java b/src/main/java/com/google/devtools/build/lib/analysis/Runfiles.java
index d14029b..93c3cef 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/Runfiles.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/Runfiles.java
@@ -345,7 +345,7 @@
   @Override
   public NestedSet<Artifact> getArtifacts() {
     NestedSetBuilder<Artifact> allArtifacts = NestedSetBuilder.stableOrder();
-    allArtifacts.addAll(unconditionalArtifacts.toCollection());
+    allArtifacts.addTransitive(unconditionalArtifacts);
     for (PruningManifest manifest : getPruningManifests()) {
       allArtifacts.addTransitive(manifest.getCandidateRunfiles());
     }