Remove stale VisibleForTesting annotation from TestSummary.

PiperOrigin-RevId: 296257029
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/TestSummary.java b/src/main/java/com/google/devtools/build/lib/runtime/TestSummary.java
index a7fe95b..4e40f2c 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/TestSummary.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/TestSummary.java
@@ -13,7 +13,6 @@
 // limitations under the License.
 package com.google.devtools.build.lib.runtime;
 
-import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ArrayListMultimap;
@@ -52,7 +51,6 @@
  * <p>Invariant: All TestSummary mutations should be performed through the Builder. No direct
  * TestSummary methods (except the constructor) may mutate the object.
  */
-@VisibleForTesting // Ideally package-scoped.
 public class TestSummary implements Comparable<TestSummary>, BuildEventWithOrderConstraint {
   /**
    * Builder class responsible for creating and altering TestSummary objects.