Bug 1546880 - Remove usage of proxy server from testing/profiles/perf/user.js. r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D32376

--HG--
extra : moz-landing-system : lando

testing/profiles/perf/user.js

@@ -75,9 +75,6 @@ user_pref("media.navigator.permission.disabled", true);
 user_pref("media.peerconnection.enabled", true);
 // Disable speculative connections so they aren't reported as leaking when they're hanging around.
 user_pref("network.http.speculative-parallel-limit", 0);
-user_pref("network.proxy.http", "localhost");
-user_pref("network.proxy.http_port", 80);
-user_pref("network.proxy.type", 1);
 // Set places maintenance far in the future (the maximum time possible in an
 // int32_t) to avoid it kicking in during tests. The maintenance can take a
 // relatively long time which may cause unnecessary intermittents and slow down