Enable messages in asserts by default

pkg/analyzer/test/generated/non_error_resolver_test.dart

Index: pkg/analyzer/test/generated/non_error_resolver_test.dart
diff --git a/pkg/analyzer/test/generated/non_error_resolver_test.dart b/pkg/analyzer/test/generated/non_error_resolver_test.dart
index 067627dbd9b4f1e6c36fe99a2b1bd08448ff893f..db2bf6ce726880d259bfbe9872a9ce4570ea93ef 100644
--- a/pkg/analyzer/test/generated/non_error_resolver_test.dart
+++ b/pkg/analyzer/test/generated/non_error_resolver_test.dart
@@ -373,7 +373,6 @@ f(A a) {
   }
 
   void test_assert_with_message_await() {
-    resetWithOptions(new AnalysisOptionsImpl()..enableAssertMessage = true);
     Source source = addSource('''
 import 'dart:async';
 f() async {
@@ -387,7 +386,6 @@ Future<String> g() => null;
   }
 
   void test_assert_with_message_dynamic() {
-    resetWithOptions(new AnalysisOptionsImpl()..enableAssertMessage = true);
     Source source = addSource('''
 f() {
   assert(false, g());
@@ -400,7 +398,6 @@ g() => null;
   }
 
   void test_assert_with_message_non_string() {
-    resetWithOptions(new AnalysisOptionsImpl()..enableAssertMessage = true);
     Source source = addSource('''
 f() {
   assert(false, 3);
@@ -412,7 +409,6 @@ f() {
   }
 
   void test_assert_with_message_null() {
-    resetWithOptions(new AnalysisOptionsImpl()..enableAssertMessage = true);
     Source source = addSource('''
 f() {
   assert(false, null);
@@ -424,7 +420,6 @@ f() {
   }
 
   void test_assert_with_message_string() {
-    resetWithOptions(new AnalysisOptionsImpl()..enableAssertMessage = true);
     Source source = addSource('''
 f() {
   assert(false, 'message');
@@ -436,7 +431,6 @@ f() {
   }
 
   void test_assert_with_message_suppresses_unused_var_hint() {
-    resetWithOptions(new AnalysisOptionsImpl()..enableAssertMessage = true);
     Source source = addSource('''
 f() {
   String message = 'msg';