Remove unused isTargetExplicit method. All usages were deleted in un…

…known commit.

    RELNOTES: None
    PiperOrigin-RevId: 241799355

dataset/GitHub_Java/bazelbuild.bazel/src/main/java/com/google/devtools/build/lib/skyframe/TargetPatternUtil.java

@@ -19,7 +19,6 @@
 import com.google.devtools.build.lib.cmdline.TargetParsingException;
 import com.google.devtools.build.lib.pkgcache.FilteringPolicies;
 import com.google.devtools.build.lib.pkgcache.FilteringPolicy;
-import com.google.devtools.build.lib.vfs.PathFragment;
 import com.google.devtools.build.skyframe.SkyFunction.Environment;
 import com.google.devtools.build.skyframe.SkyKey;
 import com.google.devtools.build.skyframe.ValueOrException;
@@ -55,14 +54,10 @@ public static ImmutableList<Label> expandTargetPatterns(
       Environment env, List<String> targetPatterns, FilteringPolicy filteringPolicy)
       throws InvalidTargetPatternException, InterruptedException {
 
-    if (targetPatterns.isEmpty()) {
-      return ImmutableList.of();
-    }
-
     // First parse the patterns, and throw any errors immediately.
     List<TargetPatternValue.TargetPatternKey> patternKeys = new ArrayList<>();
     for (TargetPatternValue.TargetPatternSkyKeyOrException keyOrException :
-        TargetPatternValue.keys(targetPatterns, filteringPolicy, PathFragment.EMPTY_FRAGMENT)) {
+        TargetPatternValue.keys(targetPatterns, filteringPolicy, "")) {
 
       try {
         patternKeys.add(keyOrException.getSkyKey());