Fix chrome_proxy_service tests broken after switch to null safety by default (#1957)

* Validate only needed summaries in expression_compiler_service

* Fix broken chrome proxy tests broken after null safety by default

Author: Anna Gringauze

dwds/test/chrome_proxy_service_test.dart

@@ -504,7 +504,7 @@ void main() {
                   !f.isConst! &&
                   !f.isFinal!),
             ]));
-      }, skip: 'https://github.com/dart-lang/webdev/issues/1818');
+      });
 
       test('Runtime classes', () async {
         final testClass = await service.getObject(
@@ -966,7 +966,7 @@ void main() {
                     !f.isConst! &&
                     !f.isFinal!),
               ]));
-        }, skip: 'https://github.com/dart-lang/webdev/issues/1818');
+        });
 
         test('offset/count parameters are ignored for bools', () async {
           final ref = await service.evaluate(
@@ -1008,7 +1008,7 @@ void main() {
           expect(obj.kind, InstanceKind.kNull);
           expect(obj.classRef!.name, 'Null');
           expect(obj.valueAsString, 'null');
-        }, skip: 'https://github.com/dart-lang/webdev/issues/1818');
+        });
       });
     });
 

fixtures/_testSound/example/hello_world/main.dart

@@ -109,7 +109,7 @@ String helloString(String response) => response;
 
 bool helloBool(bool response) => response;
 
-num helloNum(num response) => response;
+num? helloNum(num? response) => response;
 
 MyTestClass createObject(String message) => MyTestClass(message: message);
 
@@ -120,9 +120,13 @@ String messagesCombined(MyTestClass a, MyTestClass b) => a.message + b.message;
 class MyTestClass {
   final String message;
 
-  String notFinal;
+  String? notFinal;
 
-  MyTestClass({this.message = 'world'}) : notFinal = 'wonderful';
+  static final String staticMessage = 'static';
+
+  static String staticHello() => 'static hello';
+
+  MyTestClass({this.message = 'world'});
 
   String hello() => message;
 }