sec-websocket-key should be lowercased

Author: twifkak@chromium.org
Bug: 903419
Change-Id: I2dd5e05c993cd70886035b681ffb70ed29df39c0
Reviewed-on: https://chromium-review.googlesource.com/c/1328061Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Devin Mullins <twifkak@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606720}

content/browser/web_package/signed_exchange_envelope.cc

@@ -33,7 +33,7 @@ bool IsStatefulRequestHeader(base::StringPiece name) {
 
   const char* const kStatefulRequestHeaders[] = {
       "authorization", "cookie", "cookie2", "proxy-authorization",
-      "sec-webSocket-key"};
+      "sec-websocket-key"};
 
   for (const char* field : kStatefulRequestHeaders) {
     if (name == field)