[Devtools] Allow User-Agent header override for Websockets

content/child/websocket_bridge.cc

Index: content/child/websocket_bridge.cc
diff --git a/content/child/websocket_bridge.cc b/content/child/websocket_bridge.cc
index 7cfff1ad50a942960024e79ac8d98377e363642d..51d127424a275dbfe3ef4e690c3d1dcb87e156d0 100644
--- a/content/child/websocket_bridge.cc
+++ b/content/child/websocket_bridge.cc
@@ -206,6 +206,7 @@ void WebSocketBridge::DidStartClosingHandshake() {
 void WebSocketBridge::connect(const WebURL& url,
                               const WebVector<WebString>& protocols,
                               const WebSecurityOrigin& origin,
+                              const WebString& additional_headers,
                               WebSocketHandleClient* client) {
   DCHECK_EQ(kInvalidChannelId, channel_id_);
   WebSocketDispatcher* dispatcher =
@@ -221,8 +222,10 @@ void WebSocketBridge::connect(const WebURL& url,
            << base::JoinString(protocols_to_pass, ", ") << "), "
            << origin.toString().utf8() << ")";
 
+  // Headers are ISO Latin 1.
   ChildThreadImpl::current()->Send(new WebSocketHostMsg_AddChannelRequest(
-      channel_id_, url, protocols_to_pass, origin, render_frame_id_));
+      channel_id_, url, protocols_to_pass, origin,
+      additional_headers.latin1(), render_frame_id_));
 }
 
 void WebSocketBridge::send(bool fin,