Rename setters VariableElementImpl.[const3, final2] to isConst and isFinal.

pkg/analyzer/test/src/dart/constant/utilities_test.dart

Index: pkg/analyzer/test/src/dart/constant/utilities_test.dart
diff --git a/pkg/analyzer/test/src/dart/constant/utilities_test.dart b/pkg/analyzer/test/src/dart/constant/utilities_test.dart
index 6da39c128b61f5226b931d9f52fa8572d322d77d..b2e83e58f502bbc9f3c999b9d84a78121cd046eb 100644
--- a/pkg/analyzer/test/src/dart/constant/utilities_test.dart
+++ b/pkg/analyzer/test/src/dart/constant/utilities_test.dart
@@ -344,7 +344,7 @@ class ReferenceFinderTest {
     ConstLocalVariableElementImpl variableElement =
         ElementFactory.constLocalVariableElement(name);
     _tail = variableElement;
-    variableElement.const3 = isConst;
+    variableElement.isConst = isConst;
     AstFactory.variableDeclarationList2(
         isConst ? Keyword.CONST : Keyword.VAR, [variableDeclaration]);
     SimpleIdentifier identifier = AstFactory.identifier3(name);