Pepper: Move GetSandboxISA() to PPB_NaCl_Private.

ppapi/c/private/ppb_nacl_private.h

Index: ppapi/c/private/ppb_nacl_private.h
diff --git a/ppapi/c/private/ppb_nacl_private.h b/ppapi/c/private/ppb_nacl_private.h
index 53929e43ff55285285f694a16d5e804308ee1e5a..fc4b81fbe0a4e49f544affb83915f4cf31e37ea4 100644
--- a/ppapi/c/private/ppb_nacl_private.h
+++ b/ppapi/c/private/ppb_nacl_private.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From private/ppb_nacl_private.idl modified Fri Mar  7 13:41:05 2014. */
+/* From private/ppb_nacl_private.idl modified Mon Mar 10 14:22:36 2014. */
 
 #ifndef PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_NACL_PRIVATE_H_
@@ -282,6 +282,7 @@ struct PPB_NaCl_Private_1_0 {
    * will be attached to a debugger.
    */
   PP_Bool (*NaClDebugStubEnabled)(void);
+  const char* (*GetSandboxISA)(void);
 };
 
 typedef struct PPB_NaCl_Private_1_0 PPB_NaCl_Private;