Don't propose fixes to update SDK sources.

pkg/analysis_server/test/services/correction/fix_test.dart

Index: pkg/analysis_server/test/services/correction/fix_test.dart
diff --git a/pkg/analysis_server/test/services/correction/fix_test.dart b/pkg/analysis_server/test/services/correction/fix_test.dart
index cc230ca9af9892868d6d6c9ff1121bcf51e2440f..232d5602e352af658a1891214df2c0dd843ae714 100644
--- a/pkg/analysis_server/test/services/correction/fix_test.dart
+++ b/pkg/analysis_server/test/services/correction/fix_test.dart
@@ -452,6 +452,15 @@ class B extends A {
     assertNoFix(FixKind.CREATE_CONSTRUCTOR_SUPER);
   }
 
+  void test_createField_BAD_inSDK() {
+    _indexTestUnit('''
+main(List p) {
+  p.foo = 1;
+}
+''');
+    assertNoFix(FixKind.CREATE_FIELD);
+  }
+
   void test_createField_getter_multiLevel() {
     _indexTestUnit('''
 class A {
@@ -751,6 +760,15 @@ import 'my_file.dart';
     expect(fileEdit.edits[0].replacement, contains('library my.file;'));
   }
 
+  void test_createGetter_BAD_inSDK() {
+    _indexTestUnit('''
+main(List p) {
+  int v = p.foo;
+}
+''');
+    assertNoFix(FixKind.CREATE_GETTER);
+  }
+
   void test_createGetter_multiLevel() {
     _indexTestUnit('''
 class A {
@@ -2347,6 +2365,15 @@ main() {
 ''');
   }
 
+  void test_undefinedMethod_create_BAD_inSDK() {
+    _indexTestUnit('''
+main() {
+  List.foo();
+}
+''');
+    assertNoFix(FixKind.CREATE_METHOD);
+  }
+
   void test_undefinedMethod_create_generic_BAD() {
     _indexTestUnit('''
 class A<T> {