[NaCl SDK] Refactor STATUSCODE_*

native_client_sdk/src/libraries/nacl_io/library.dsc

 {
   'TOOLS': ['clang-newlib', 'glibc', 'pnacl', 'linux', 'mac'],
   'SEARCH': [
     '.',
     'pepper',
     '../third_party/newlib-extras',
     'include',
   ],
   'TARGETS': [
     {
@@ skipping 156 matching lines @@
         "fuse.h",
         "getdents_helper.h",
         "googledrivefs/googledrivefs.h",
         "googledrivefs/googledrivefs_node.h",
         "hash.h",
         "host_resolver.h",
         "html5fs/html5_fs.h",
         "html5fs/html5_fs_node.h",
         "httpfs/http_fs.h",
         "httpfs/http_fs_node.h",
+        "http_status_codes.h",
         "inode_pool.h",
         "ioctl.h",
         "jsfs/js_fs.h",
         "jsfs/js_fs_node.h",
         "nacl_abi_types.h",
         "kernel_handle.h",
         "kernel_intercept.h",
         "kernel_object.h",
         "kernel_proxy.h",
         "kernel_wrap.h",
@@ skipping 107 matching lines @@
         "all_interfaces.h",
         "define_empty_macros.h",
         "undef_macros.h",
       ],
       'DEST': 'include/nacl_io/pepper',
     }
   ],
   'DEST': 'src',
   'NAME': 'nacl_io',
 }