Ensure interfaces are loaded.

dart/lib/compiler/implementation/compiler.dart

 // Copyright (c) 2012, 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.
 
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
 final bool REPORT_EXCESS_RESOLUTION = false;
@@ skipping 902 matching lines @@
       codegenWorld.addGeneratedCode(work, codeBuffer);
       return codeBuffer.toString();
     }
   }
 
   void registerInstantiatedClass(ClassElement cls) {
     enqueuer.resolution.registerInstantiatedClass(cls);
     enqueuer.codegen.registerInstantiatedClass(cls);
   }
 
-  void resolveClass(ClassElement element) {
-    withCurrentElement(element, () => resolver.resolveClass(element));
-  }
-
   Type resolveTypeAnnotation(Element element, TypeAnnotation annotation) {
     return resolver.resolveTypeAnnotation(element, annotation);
   }
 
   FunctionSignature resolveSignature(FunctionElement element) {
     return withCurrentElement(element,
                               () => resolver.resolveSignature(element));
   }
 
   FunctionSignature resolveFunctionExpression(Element element,
@@ skipping 166 matching lines @@
     final endOffset = end.charOffset + end.slowCharCount;
 
     // [begin] and [end] might be the same for the same empty token. This
     // happens for instance when scanning '$$'.
     assert(endOffset >= beginOffset);
     return f(beginOffset, endOffset);
   }
 
   String toString() => 'SourceSpan($uri, $begin, $end)';
 }