Remove support for interfaces.

runtime/vm/compiler.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 "vm/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/code_generator.h"
@@ skipping 535 matching lines @@
   }
   UNREACHABLE();
   return Error::null();
 }
 
 
 RawError* Compiler::CompileAllFunctions(const Class& cls) {
   Error& error = Error::Handle();
   Array& functions = Array::Handle(cls.functions());
   Function& func = Function::Handle();
+  // Class dynamic lives in the vm isolate. Its array fields cannot be set to
+  // an empty array.
+  if (functions.IsNull()) {
+    ASSERT(cls.IsDynamicClass());
+    return error.raw();
+  }
   for (int i = 0; i < functions.Length(); i++) {
     func ^= functions.At(i);
     ASSERT(!func.IsNull());
     if (!func.HasCode() &&
         !func.is_abstract() &&
         !func.IsRedirectingFactory()) {
       error = CompileFunction(func);
       if (!error.IsNull()) {
         return error.raw();
       }
@@ skipping 61 matching lines @@
     result = isolate->object_store()->sticky_error();
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart