Move remaining helpers to BackendHelpers

pkg/compiler/lib/src/js_backend/custom_elements_analysis.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of js_backend;
 
 /**
  * Support for Custom Elements.
  *
  * The support for custom elements the compiler builds a table that maps the
@@ skipping 83 matching lines @@
   void registerTypeConstant(Element element, Enqueuer enqueuer) {
     assert(element.isClass);
     assert(!enqueuer.isResolutionQueue);
     codegenJoin.selectedClasses.add(element);
   }
 
   void registerStaticUse(Element element, Enqueuer enqueuer) {
     assert(element != null);
     if (!fetchedTableAccessorMethod) {
       fetchedTableAccessorMethod = true;
-      tableAccessorMethod = backend.findInterceptor(
-          'findIndexForNativeSubclassType');
+      tableAccessorMethod = backend.helpers.findIndexForNativeSubclassType;
     }
     if (element == tableAccessorMethod) {
       joinFor(enqueuer).demanded = true;
     }
   }
 
   void onQueueEmpty(Enqueuer enqueuer) {
     joinFor(enqueuer).flush(enqueuer);
   }
 
@@ skipping 81 matching lines @@
           result.add(member);
         }
       }
     }
     classElement.forEachMember(selectGenerativeConstructors,
         includeBackendMembers: false,
         includeSuperAndInjectedMembers: false);
     return result;
   }
 }