Pepper: Move GetSandboxISA() to PPB_NaCl_Private.

ppapi/native_client/src/trusted/plugin/arch_mips/sandbox_isa.cc

Index: ppapi/native_client/src/trusted/plugin/arch_mips/sandbox_isa.cc
diff --git a/ppapi/native_client/src/trusted/plugin/arch_mips/sandbox_isa.cc b/ppapi/native_client/src/trusted/plugin/arch_mips/sandbox_isa.cc
deleted file mode 100644
index a3c0eaa1acf6e2b2c4d8cf413d5f79c07c9a6da4..0000000000000000000000000000000000000000
--- a/ppapi/native_client/src/trusted/plugin/arch_mips/sandbox_isa.cc
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2014 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 "ppapi/native_client/src/trusted/plugin/nexe_arch.h"
-
-namespace {
-// The list of supported ISA strings for MIPS.  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 kNexeArchMIPS = "mips32";
-}  // namespace
-
-namespace plugin {
-const char* GetSandboxISA() {
-  return kNexeArchMIPS;
-}
-}  // namespace plugin