Remove more question marks.

sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart

Index: sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
diff --git a/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart b/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
index 80671f8cf067acb2a893015a36fee3d550bbb7e4..0d9ad22745236fc33b9e781a73b98ce2c0f56d8c 100644
--- a/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
+++ b/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
@@ -302,7 +302,7 @@ class Database extends EventTarget native "IDBDatabase" {
   @DomName('IDBDatabase.createObjectStore')
   @DocsEditable
   ObjectStore $dom_createObjectStore(String name, [Map options]) {
-    if (?options) {
+    if (options != null) {
       var options_1 = convertDartToNative_Dictionary(options);
       return _$dom_createObjectStore_1(name, options_1);
     }
@@ -864,7 +864,7 @@ class ObjectStore native "IDBObjectStore" {
   @Creates('Request')
   @_annotation_Creates_IDBKey
   Request $dom_add(/*any*/ value, [/*any*/ key]) {
-    if (?key) {
+    if (key != null) {
       var value_1 = convertDartToNative_SerializedScriptValue(value);
       var key_2 = convertDartToNative_SerializedScriptValue(key);
       return _$dom_add_1(value_1, key_2);
@@ -900,7 +900,7 @@ class ObjectStore native "IDBObjectStore" {
   @DomName('IDBObjectStore.createIndex')
   @DocsEditable
   Index $dom_createIndex(String name, keyPath, [Map options]) {
-    if ((keyPath is List<String> || keyPath == null) && !?options) {
+    if ((keyPath is List<String> || keyPath == null) && options == null) {
       List keyPath_1 = convertDartToNative_StringArray(keyPath);
       return _$dom_createIndex_1(name, keyPath_1);
     }
@@ -909,7 +909,7 @@ class ObjectStore native "IDBObjectStore" {
       var options_3 = convertDartToNative_Dictionary(options);
       return _$dom_createIndex_2(name, keyPath_2, options_3);
     }
-    if ((keyPath is String || keyPath == null) && !?options) {
+    if ((keyPath is String || keyPath == null) && options == null) {
       return _$dom_createIndex_3(name, keyPath);
     }
     if ((keyPath is String || keyPath == null)) {
@@ -970,7 +970,7 @@ class ObjectStore native "IDBObjectStore" {
   @Creates('Request')
   @_annotation_Creates_IDBKey
   Request $dom_put(/*any*/ value, [/*any*/ key]) {
-    if (?key) {
+    if (key != null) {
       var value_1 = convertDartToNative_SerializedScriptValue(value);
       var key_2 = convertDartToNative_SerializedScriptValue(key);
       return _$dom_put_1(value_1, key_2);