Make QuicSpdyStream::ParseHeaderStatusCode() inparam const.

net/tools/quic/quic_simple_server_stream.cc

Index: net/tools/quic/quic_simple_server_stream.cc
diff --git a/net/tools/quic/quic_simple_server_stream.cc b/net/tools/quic/quic_simple_server_stream.cc
index 21a7a8fd2adddda326d9e036a2e0f9cddf271dff..96b733cebd7f6c13f4b2b8ec98415fc2636dd453 100644
--- a/net/tools/quic/quic_simple_server_stream.cc
+++ b/net/tools/quic/quic_simple_server_stream.cc
@@ -168,11 +168,11 @@ void QuicSimpleServerStream::SendResponse() {
   string request_url = request_headers_[":authority"].as_string() +
                        request_headers_[":path"].as_string();
   int response_code;
-  SpdyHeaderBlock response_headers = response->headers();
-  if (!ParseHeaderStatusCode(&response_headers, &response_code)) {
-    DVLOG(1) << "Illegal (non-integer) response :status from cache: "
-             << response_headers[":status"].as_string() << " for request "
-             << request_url;
+  const SpdyHeaderBlock& response_headers = response->headers();
+  if (!ParseHeaderStatusCode(response_headers, &response_code)) {
+    LOG(WARNING) << "Illegal (non-integer) response :status from cache: "
+                 << response_headers.GetHeader(":status") << " for request "
+                 << request_url;
     SendErrorResponse();
     return;
   }