Remove src/trusted/plugin

src/trusted/plugin/arch_arm/sandbox_isa.cc

-// Copyright 2010 The Native Client 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 "native_client/src/trusted/plugin/nexe_arch.h"
-
-namespace {
-// The list of supported ISA strings for ARM.  See issue:
-//   http://code.google.com/p/nativeclient/issues/detail?id=1040 for more
-// information.  Note that these string are to be case-insensitive compared.
-const char* const kNexeArchARM = "arm";
-}  // namespace
-
-namespace plugin {
-const char* GetSandboxISA() {
-  return kNexeArchARM;
-}
-}  // namespace plugin