Flush InterfaceTypeImpl cached memebers when ClassElement.version is different.

pkg/analyzer/test/src/context/context_test.dart

Index: pkg/analyzer/test/src/context/context_test.dart
diff --git a/pkg/analyzer/test/src/context/context_test.dart b/pkg/analyzer/test/src/context/context_test.dart
index 2ec73ef24439d17e96e4cf5c4821faafd4476335..e3ade788bf3a1f7049793cea6f33537cc7ddedb6 100644
--- a/pkg/analyzer/test/src/context/context_test.dart
+++ b/pkg/analyzer/test/src/context/context_test.dart
@@ -3092,6 +3092,43 @@ class C {}
     expect(context.getErrors(b).errors, hasLength(1));
   }
 
+  void test_sequence_class_removeMethod_overridden() {
+    Source a = addSource(
+        '/a.dart',
+        r'''
+class A {
+  void foo() {}
+}
+''');
+    Source b = addSource(
+        '/b.dart',
+        r'''
+import 'a.dart';
+class B extends A {
+  @override
+  void foo() {}
+}
+''');
+    _performPendingAnalysisTasks();
+    expect(context.getErrors(b).errors, hasLength(0));
+    // Update a.dart: remove add A.foo.
+    //   b.dart has a new hint, because B.foo does not override anything
+    context.setContents(
+        a,
+        r'''
+class A {
+}
+''');
+    _assertValidForChangedLibrary(a);
+    _assertInvalid(a, LIBRARY_ERRORS_READY);
+    _assertValidForDependentLibrary(b);
+    _assertInvalid(b, LIBRARY_ERRORS_READY);
+    _assertInvalidUnits(b, RESOLVED_UNIT4);
+
+    _performPendingAnalysisTasks();
+    expect(context.getErrors(b).errors, hasLength(1));
+  }
+
   void test_sequence_inBodyChange_addRef_deltaChange() {
     Source a = addSource(
         '/a.dart',