删除tango_cache_pending.h中的枚举类型enum tfe_http_std_field

在tfe_http.h的枚举类型tfe_http_std_field中添加下列成员：
   TLF_HTTP_CACHE_CONTROL,TLF_HTTP_IF_MATCH,TLF_HTTP_IF_NONE_MATCH,
   TFE_HTTP_IF_MODIFIED_SINCE,TFE_HTTP_IF_UNMODIFIED_SINCE,
   TFE_HTPP_LAST_MODIFIED

cache/include/tango_cache_pending.h

@@ -1,42 +1,7 @@
 #pragma once
 
 #include<time.h>
-
-enum tfe_http_std_field
-{
-    TFE_HTTP_UNKNOWN_FIELD = 0,
-    TFE_HTTP_HOST,
-    TFE_HTTP_REFERER,
-    TFE_HTTP_USER_AGENT,
-    TFE_HTTP_COOKIE,
-    TFE_HTTP_PROXY_AUTHORIZATION,
-    TFE_HTTP_AUTHORIZATION,
-    TFE_HTTP_LOCATION,
-    TFE_HTTP_SERVER,
-    TFE_HTTP_ETAG,
-    TFE_HTTP_DATE,
-    TFE_HTTP_TRAILER,
-    TFE_HTTP_TRANSFER_ENCODING,
-    TFE_HTTP_VIA,
-    TFE_HTTP_PRAGMA,
-    TFE_HTTP_CONNECTION,
-    TFE_HTTP_CONT_ENCODING,
-    TFE_HTTP_CONT_LANGUAGE,
-    TFE_HTTP_CONT_LOCATION,
-    TFE_HTTP_CONT_RANGE,
-    TFE_HTTP_CONT_LENGTH,
-    TFE_HTTP_CONT_TYPE,
-    TFE_HTTP_CONT_DISPOSITION,
-    TFE_HTTP_EXPIRES,
-    TFE_HTTP_ACCEPT_ENCODING,
-    TFE_HTTP_CACHE_CONTROL,
-    TLF_HTTP_IF_MATCH,
-    TLF_HTTP_IF_NONE_MATCH,
-    TLF_HTTP_IF_MODIFIED_SINCE,
-    TLF_HTTP_IF_UNMODIFIED_SINCE,
-    TLF_HTTP_LAST_MODIFIED
-};
-
+#include<tfe_http.h>
 
 enum cache_pending_action {
     UNDEFINED = 0,