Remove support for interfaces.

runtime/vm/dart_api_impl.cc

 // 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.
 
 #include "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 2447 matching lines @@
 }
 
 
 // --- Classes and Interfaces ---
 
 
 DART_EXPORT bool Dart_IsClass(Dart_Handle handle) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(handle));
-  if (obj.IsClass()) {
-    return !Class::Cast(obj).is_interface();
-  }
-  return false;
-}
-
-
-DART_EXPORT bool Dart_IsInterface(Dart_Handle handle) {
-  Isolate* isolate = Isolate::Current();
-  DARTSCOPE(isolate);
-  const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(handle));
-  if (obj.IsClass()) {
-    return Class::Cast(obj).is_interface();
-  }
-  return false;
+  return obj.IsClass();
 }
 
 
 DART_EXPORT Dart_Handle Dart_ClassName(Dart_Handle clazz) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const Class& cls = Api::UnwrapClassHandle(isolate, clazz);
   if (cls.IsNull()) {
     RETURN_TYPE_ERROR(isolate, clazz, Class);
   }
@@ skipping 1958 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success(isolate);
 }
 
 }  // namespace dart