Move LibraryUnitTarget into API.

pkg/analyzer/lib/src/task/dart.dart

Index: pkg/analyzer/lib/src/task/dart.dart
diff --git a/pkg/analyzer/lib/src/task/dart.dart b/pkg/analyzer/lib/src/task/dart.dart
index 93e2f088e77918f52f0f68cac2caa098d442a129..5b7de2dbea3166bcac08f00b28e1a4b088f03d51 100644
--- a/pkg/analyzer/lib/src/task/dart.dart
+++ b/pkg/analyzer/lib/src/task/dart.dart
@@ -18,7 +18,6 @@ import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:analyzer/src/task/driver.dart';
 import 'package:analyzer/src/task/general.dart';
 import 'package:analyzer/task/dart.dart';
@@ -1897,31 +1896,6 @@ class GenerateHintsTask extends SourceBasedAnalysisTask {
 }
 
 /**
- * A pair of a library [Source] and a unit [Source] in this library.
- */
-class LibraryUnitTarget implements AnalysisTarget {
-  final Source library;
-  final Source unit;
-
-  LibraryUnitTarget(this.library, this.unit);
-
-  @override
-  int get hashCode {
-    return JenkinsSmiHash.combine(library.hashCode, unit.hashCode);
-  }
-
-  @override
-  Source get source => unit;
-
-  @override
-  bool operator ==(other) {
-    return other is LibraryUnitTarget &&
-        other.library == library &&
-        other.unit == unit;
-  }
-}
-
-/**
  * A task that parses the content of a Dart file, producing an AST structure.
  */
 class ParseDartTask extends SourceBasedAnalysisTask {