Pepper: Move GetSandboxISA() to PPB_NaCl_Private.

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

Index: ppapi/native_client/src/trusted/plugin/plugin.cc
diff --git a/ppapi/native_client/src/trusted/plugin/plugin.cc b/ppapi/native_client/src/trusted/plugin/plugin.cc
index 47a31f36b6e195351c5f409ea8ccbe25805139b4..529a963df07d4e966b0bf4431ce3b4d4c9b7c266 100644
--- a/ppapi/native_client/src/trusted/plugin/plugin.cc
+++ b/ppapi/native_client/src/trusted/plugin/plugin.cc
@@ -42,7 +42,6 @@
 #include "ppapi/native_client/src/trusted/plugin/json_manifest.h"
 #include "ppapi/native_client/src/trusted/plugin/nacl_entry_points.h"
 #include "ppapi/native_client/src/trusted/plugin/nacl_subprocess.h"
-#include "ppapi/native_client/src/trusted/plugin/nexe_arch.h"
 #include "ppapi/native_client/src/trusted/plugin/plugin_error.h"
 #include "ppapi/native_client/src/trusted/plugin/service_runtime.h"
 #include "ppapi/native_client/src/trusted/plugin/utility.h"
@@ -530,7 +529,7 @@ Plugin* Plugin::New(PP_Instance pp_instance) {
 // failure. Note that module loading functions will log their own errors.
 bool Plugin::Init(uint32_t argc, const char* argn[], const char* argv[]) {
   PLUGIN_PRINTF(("Plugin::Init (argc=%" NACL_PRIu32 ")\n", argc));
-  HistogramEnumerateOsArch(GetSandboxISA());
+  HistogramEnumerateOsArch(nacl_interface_->GetSandboxISA());
   init_time_ = NaClGetTimeOfDayMicroseconds();
   url_util_ = pp::URLUtil_Dev::Get();
   if (url_util_ == NULL)
@@ -1154,10 +1153,11 @@ bool Plugin::SetManifestObject(const nacl::string& manifest_json,
   bool nonsfi_mode_enabled =
       PP_ToBool(nacl_interface_->IsNonSFIModeEnabled());
   bool pnacl_debug = GetNaClInterface()->NaClDebugStubEnabled();
+  const char* sandbox_isa = nacl_interface_->GetSandboxISA();
   nacl::scoped_ptr<JsonManifest> json_manifest(
       new JsonManifest(url_util_,
                        manifest_base_url(),
-                       (is_pnacl ? kPortableISA : GetSandboxISA()),
+                       (is_pnacl ? kPortableISA : sandbox_isa),
                        nonsfi_mode_enabled,
                        pnacl_debug));
   if (!json_manifest->Init(manifest_json, error_info)) {