move extractDefinedVariables from analyzer cli to analyzer

pkg/analyzer_cli/test/options_test.dart

Index: pkg/analyzer_cli/test/options_test.dart
diff --git a/pkg/analyzer_cli/test/options_test.dart b/pkg/analyzer_cli/test/options_test.dart
index f30a6e4540f52bfb26cca3af8dded759473654ed..35a1d4f14019cf3fa840501773ef123e180ee9f4 100644
--- a/pkg/analyzer_cli/test/options_test.dart
+++ b/pkg/analyzer_cli/test/options_test.dart
@@ -154,8 +154,7 @@ main() {
 
       test('notice unrecognized flags', () {
         expect(
-            () => new CommandLineParser()
-                .parse(['--bar', '--baz', 'foo.dart'], {}),
+            () => new CommandLineParser().parse(['--bar', '--baz', 'foo.dart']),
             throwsA(new isInstanceOf<FormatException>()));
       });
 
@@ -178,7 +177,7 @@ main() {
         parser.addOption('optionA');
         parser.addFlag('flagA');
         ArgResults argResults =
-            parser.parse(['--optionA=1', '--optionB=2', '--flagA'], {});
+            parser.parse(['--optionA=1', '--optionB=2', '--flagA']);
         expect(argResults['optionA'], '1');
         expect(argResults['flagA'], isTrue);
       });