Revert collecting defined elements.

pkg/analyzer/test/src/task/dart_test.dart

Index: pkg/analyzer/test/src/task/dart_test.dart
diff --git a/pkg/analyzer/test/src/task/dart_test.dart b/pkg/analyzer/test/src/task/dart_test.dart
index 9215145dae8e44e23ab4766f1f23d3376ee616a5..9bf00502d75e456d7f8bfd004906a55939309dcf 100644
--- a/pkg/analyzer/test/src/task/dart_test.dart
+++ b/pkg/analyzer/test/src/task/dart_test.dart
@@ -2267,8 +2267,6 @@ main() {
 
 @reflectiveTest
 class GatherUsedLocalElementsTaskTest extends _AbstractDartTaskTest {
-  List<Element> definedElements;
-  Set<String> definedElementNames;
   UsedLocalElements usedElements;
   Set<String> usedElementNames;
 
@@ -2333,7 +2331,6 @@ main() {
 }''');
     _computeUsedElements(source);
     // validate
-    expect(definedElementNames, unorderedEquals(['main', 'v1', 'v2']));
     expect(usedElementNames, unorderedEquals(['v2']));
   }
 
@@ -2353,30 +2350,14 @@ main(A a, p) {
 ''');
     _computeUsedElements(source);
     // validate
-    expect(definedElementNames,
-        unorderedEquals(['A', '_m1', '_m2', 'main', 'a', 'p']));
     expect(usedElementNames, unorderedEquals(['A', 'a', 'p', '_m2']));
     expect(usedElements.members, unorderedEquals(['_m2', '_m3']));
   }
 
-  test_perform_unresolvedImportWithPrefix() {
-    Source source = newSource(
-        '/test.dart',
-        r'''
-import 'x' as p;
-''');
-    _computeUsedElements(source);
-    // validate
-    expect(definedElementNames, isEmpty);
-    expect(usedElementNames, isEmpty);
-  }
-
   void _computeUsedElements(Source source) {
     LibrarySpecificUnit target = new LibrarySpecificUnit(source, source);
     computeResult(target, USED_LOCAL_ELEMENTS,
         matcher: isGatherUsedLocalElementsTask);
-    definedElements = outputs[DEFINED_ELEMENTS];
-    definedElementNames = definedElements.map((e) => e.name).toSet();
     usedElements = outputs[USED_LOCAL_ELEMENTS];
     usedElementNames = usedElements.elements.map((e) => e.name).toSet();
   }