Allow uniquifiers to throw QueryExceptions.

RELNOTES: None.
PiperOrigin-RevId: 202961077
diff --git a/src/main/java/com/google/devtools/build/lib/query2/PostAnalysisQueryEnvironment.java b/src/main/java/com/google/devtools/build/lib/query2/PostAnalysisQueryEnvironment.java
index 956abf5..89aae59 100644
--- a/src/main/java/com/google/devtools/build/lib/query2/PostAnalysisQueryEnvironment.java
+++ b/src/main/java/com/google/devtools/build/lib/query2/PostAnalysisQueryEnvironment.java
@@ -403,8 +403,7 @@
 
   @Override
   public Uniquifier<T> createUniquifier() {
-    return new UniquifierImpl<>(
-        getConfiguredTargetKeyExtractor(), SkyQueryEnvironment.DEFAULT_THREAD_COUNT);
+    return new UniquifierImpl<>(getConfiguredTargetKeyExtractor());
   }
 
   @Override