Added HttpUtils::HasValidators and HttpResponse::HasValidators

net/http/http_response_headers.h

Index: net/http/http_response_headers.h
diff --git a/net/http/http_response_headers.h b/net/http/http_response_headers.h
index 8f227be16367299b1ae06607695439ac33f1729d..238acda1ad95ab996c04a74a31d58ece29562209 100644
--- a/net/http/http_response_headers.h
+++ b/net/http/http_response_headers.h
@@ -258,6 +258,11 @@ class NET_EXPORT HttpResponseHeaders
   // See section 13.3.3 of RFC 2616.
   bool HasStrongValidators() const;
 
+  // Returns true if this response has any validator (either a Last-Modified or
+  // an ETag) regardless of whether it is strong or weak.  See section 13.3.3 of
+  // RFC 2616.
+  bool HasValidators() const;
+
   // Extracts the value of the Content-Length header or returns -1 if there is
   // no such header in the response.
   int64_t GetContentLength() const;