Move remaining helpers to BackendHelpers

tests/compiler/dart2js/resolution_test.dart

Index: tests/compiler/dart2js/resolution_test.dart
diff --git a/tests/compiler/dart2js/resolution_test.dart b/tests/compiler/dart2js/resolution_test.dart
index 639755a1400eccea16459fff83f120bdf7a656ab..d9241a893355239155494784ac01855f9bbb8e4d 100644
--- a/tests/compiler/dart2js/resolution_test.dart
+++ b/tests/compiler/dart2js/resolution_test.dart
@@ -102,14 +102,14 @@ void test(String code, void check(Compiler compiler)) {
 
 void testHasRuntimeType(String code) {
   test(code, (compiler) {
-    var element = compiler.backend.findHelper('createRuntimeType');
+    var element = compiler.backend.helpers.createRuntimeType;
     Expect.isTrue(compiler.enqueuer.resolution.isProcessed(element));
   });
 }
 
 main() {
   test(NO_RUNTIME_TYPE, (compiler) {
-    var element = compiler.backend.findHelper('createRuntimeType');
+    var element = compiler.backend.helpers.createRuntimeType;
     Expect.isFalse(compiler.enqueuer.resolution.isProcessed(element));
   });