Enable //services/files/c:apptests on Android now that we have the C++11 library.

services/files/c/lib/util.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/files/c/lib/util.h"
 
+#include <assert.h>
 #include <errno.h>
 
 namespace mojio {
 
 int ErrorToErrno(mojo::files::Error error) {
   switch (error) {
     // TODO(vtl): Real errno encodings....
     case mojo::files::ERROR_OK:
       return 0;
     case mojo::files::ERROR_UNKNOWN:
@@ skipping 12 matching lines @@
       return ENOSYS;
     case mojo::files::ERROR_CLOSED:
       return EBADF;
     case mojo::files::ERROR_UNAVAILABLE:
       // TODO(vtl): May sometimes be EAGAIN?
       return EACCES;
     case mojo::files::ERROR_INTERNAL:
       // TODO(vtl): Something better?
       return EIO;
   }
+  assert(false);
+  // TODO(vtl): Something better?
+  return EIO;
 }
 
 }  // namespace mojio