dart:developer service extension fixes

runtime/observatory/tests/service/file_service_test.dart

Index: runtime/observatory/tests/service/file_service_test.dart
diff --git a/runtime/observatory/tests/service/file_service_test.dart b/runtime/observatory/tests/service/file_service_test.dart
index 22b58272b9d59657863c190105f4e8c00914ec05..25500c665f8980fdfc96932dc8ec1eadc48903b0 100644
--- a/runtime/observatory/tests/service/file_service_test.dart
+++ b/runtime/observatory/tests/service/file_service_test.dart
@@ -64,20 +64,21 @@ Future setupFiles() async {
     var result = JSON.encode({'type' : 'foobar'});
     return new Future.value(new ServiceExtensionResponse.result(result));
   }
-  registerExtension('__cleanup', cleanup);
-  registerExtension('__setup', setup);
+  registerExtension('ext.dart.io.cleanup', cleanup);
+  registerExtension('ext.dart.io.setup', setup);
 }
 
 var fileTests = [
   (Isolate isolate) async {
-    await isolate.invokeRpcNoUpgrade('__setup', {});
+    await isolate.invokeRpcNoUpgrade('ext.dart.io.setup', {});
     try {
-      var result = await isolate.invokeRpcNoUpgrade('__getOpenFiles', {});
+      var result =
+          await isolate.invokeRpcNoUpgrade('ext.dart.io.getOpenFiles', {});
       expect(result['type'], equals('_openfiles'));
 
       expect(result['data'].length, equals(2));
       var writing = await isolate.invokeRpcNoUpgrade(
-           '__getFileByID', { 'id' : result['data'][0]['id'] });
+           'ext.dart.io.getFileByID', { 'id' : result['data'][0]['id'] });
 
       expect(writing['totalRead'], equals(0));
       expect(writing['readCount'], equals(0));
@@ -87,7 +88,7 @@ var fileTests = [
       expect(writing['lastRead'], equals(0));
 
       var reading = await isolate.invokeRpcNoUpgrade(
-          '__getFileByID', { 'id' : result['data'][1]['id'] });
+          'ext.dart.io.getFileByID', { 'id' : result['data'][1]['id'] });
 
       expect(reading['totalRead'], equals(5));
       expect(reading['readCount'], equals(5));
@@ -97,7 +98,7 @@ var fileTests = [
       expect(reading['lastRead'], greaterThan(0));
 
     } finally {
-      await isolate.invokeRpcNoUpgrade('__cleanup', {});
+      await isolate.invokeRpcNoUpgrade('ext.dart.io.cleanup', {});
     }
   },
 ];