Drive-by clean-up: Remove unused visitedMap

PiperOrigin-RevId: 184913521
diff --git a/src/main/java/com/google/devtools/build/lib/query2/LabelVisitor.java b/src/main/java/com/google/devtools/build/lib/query2/LabelVisitor.java
index 14d1fda..6f18da7 100644
--- a/src/main/java/com/google/devtools/build/lib/query2/LabelVisitor.java
+++ b/src/main/java/com/google/devtools/build/lib/query2/LabelVisitor.java
@@ -16,11 +16,8 @@
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Throwables;
-import com.google.common.collect.HashMultimap;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMultimap;
-import com.google.common.collect.Multimaps;
-import com.google.common.collect.SetMultimap;
 import com.google.devtools.build.lib.cmdline.Label;
 import com.google.devtools.build.lib.concurrent.AbstractQueueVisitor;
 import com.google.devtools.build.lib.concurrent.ErrorClassifier;
@@ -35,7 +32,6 @@
 import com.google.devtools.build.lib.packages.InputFile;
 import com.google.devtools.build.lib.packages.NoSuchThingException;
 import com.google.devtools.build.lib.packages.OutputFile;
-import com.google.devtools.build.lib.packages.Package;
 import com.google.devtools.build.lib.packages.PackageGroup;
 import com.google.devtools.build.lib.packages.Rule;
 import com.google.devtools.build.lib.packages.RuleClass;
@@ -150,8 +146,6 @@
    */
   private final TargetProvider targetProvider;
   private final DependencyFilter edgeFilter;
-  private final SetMultimap<Package, Target> visitedMap =
-      Multimaps.synchronizedSetMultimap(HashMultimap.<Package, Target>create());
   private final ConcurrentMap<Label, Integer> visitedTargets = new ConcurrentHashMap<>();
 
   private VisitationAttributes lastVisitation;
@@ -207,7 +201,6 @@
       int maxDepth,
       TargetEdgeObserver... observers)
       throws InterruptedException {
-    visitedMap.clear();
     visitedTargets.clear();
 
     Visitor visitor = new Visitor(eventHandler, keepGoing, parallelThreads, maxDepth, observers);
@@ -400,8 +393,6 @@
         observeEdge(from, attribute, target);
         visitAspectsIfRequired(from, attribute, target, depth, count);
       }
-
-      visitedMap.put(target.getPackage(), target);
       visitTargetNode(target, depth, count);
     }