Added HttpUtils::HasValidators and HttpResponse::HasValidators

net/http/http_response_headers.cc

Index: net/http/http_response_headers.cc
diff --git a/net/http/http_response_headers.cc b/net/http/http_response_headers.cc
index f89c30da776362925e868456377da949bf19327a..4673c5fe606877533da574be49651f236f8e3b5b 100644
--- a/net/http/http_response_headers.cc
+++ b/net/http/http_response_headers.cc
@@ -1242,6 +1242,15 @@ bool HttpResponseHeaders::HasStrongValidators() const {
                                        date_header);
 }
 
+bool HttpResponseHeaders::HasValidators() const {
+  std::string etag_header;
+  EnumerateHeader(NULL, "etag", &etag_header);
+  std::string last_modified_header;
+  EnumerateHeader(NULL, "Last-Modified", &last_modified_header);
+  return HttpUtil::HasValidators(GetHttpVersion(), etag_header,
+                                 last_modified_header);
+}
+
 // From RFC 2616:
 // Content-Length = "Content-Length" ":" 1*DIGIT
 int64 HttpResponseHeaders::GetContentLength() const {