[Devtools] Allow User-Agent header override for Websockets

net/websockets/websocket_end_to_end_test.cc

Index: net/websockets/websocket_end_to_end_test.cc
diff --git a/net/websockets/websocket_end_to_end_test.cc b/net/websockets/websocket_end_to_end_test.cc
index 55c47996deb4b16abaa9ec4ef1e72f6627fa58ac..c471ccb5d7600cfb3b7d98f61a37acbfc796e7e7 100644
--- a/net/websockets/websocket_end_to_end_test.cc
+++ b/net/websockets/websocket_end_to_end_test.cc
@@ -268,7 +268,8 @@ class WebSocketEndToEndTest : public ::testing::Test {
     event_interface_ = new ConnectTestingEventInterface;
     channel_.reset(
         new WebSocketChannel(base::WrapUnique(event_interface_), &context_));
-    channel_->SendAddChannelRequest(GURL(socket_url), sub_protocols_, origin);
+    channel_->SendAddChannelRequest(GURL(socket_url), sub_protocols_, origin,
+                                    "");
     event_interface_->WaitForResponse();
     return !event_interface_->failed();
   }