Revert collecting defined elements.

pkg/analyzer/lib/src/generated/resolver.dart

Index: pkg/analyzer/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index 59359c19e033baa505730e881a6fa2a963e29a0b..45c75b2ebc9b0c49a30b296f92e4762dff94b301 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -4015,7 +4015,6 @@ class GatherUsedImportedElementsVisitor extends RecursiveAstVisitor {
  * An [AstVisitor] that fills [UsedLocalElements].
  */
 class GatherUsedLocalElementsVisitor extends RecursiveAstVisitor {
-  final List<Element> definedElements = <Element>[];
   final UsedLocalElements usedElements = new UsedLocalElements();
 
   final LibraryElement _enclosingLibrary;
@@ -4085,13 +4084,10 @@ class GatherUsedLocalElementsVisitor extends RecursiveAstVisitor {
 
   @override
   visitSimpleIdentifier(SimpleIdentifier node) {
-    Element element = node.staticElement;
     if (node.inDeclarationContext()) {
-      if (element != null) {
-        definedElements.add(element);
-      }
       return;
     }
+    Element element = node.staticElement;
     bool isIdentifierRead = _isReadIdentifier(node);
     if (element is LocalVariableElement) {
       if (isIdentifierRead) {
@@ -12237,7 +12233,7 @@ class TypeResolverVisitor extends ScopedVisitor {
  * structure looking for cases of [HintCode.UNUSED_ELEMENT],
  * [HintCode.UNUSED_FIELD], [HintCode.UNUSED_LOCAL_VARIABLE], etc.
  */
-class UnusedLocalElementsVerifier extends SimpleElementVisitor {
+class UnusedLocalElementsVerifier extends RecursiveElementVisitor {
   /**
    * The error listener to which errors will be reported.
    */