Remove the HANDLED_EXTERNALLY status code.

net/base/net_errors.h

Index: net/base/net_errors.h
diff --git a/net/base/net_errors.h b/net/base/net_errors.h
index 761c2d2af41a7257ab8d83be628fe8806ef2655b..8347fcf85a82a6b3efe0f2d3241fa7bd16811195 100644
--- a/net/base/net_errors.h
+++ b/net/base/net_errors.h
@@ -20,6 +20,7 @@ NET_EXPORT extern const char kErrorDomain[];
 enum Error {
   // No error.
   OK = 0,
+  OK_HANDLED_EXTERNALLY = 1,
 
 #define NET_ERROR(label, value) ERR_ ## label = value,
 #include "net/base/net_error_list.h"
@@ -39,6 +40,15 @@ inline bool IsCertificateError(int error) {
   return error <= ERR_CERT_BEGIN && error > ERR_CERT_END;
 }
 
+// Returns true if |error| is a success error code.
+inline bool IsSuccess(int error) {
+  return error >= OK;
+}
+
+inline bool IsSuccessOrPending(int error) {
+  return IsSuccess(error) || error == ERR_IO_PENDING;
+}
+
 // Map system error code to Error.
 NET_EXPORT Error MapSystemError(int os_error);