Bug 1582637 - Reduce devicechange fake event and test timeout times. r=jib

This allows the mochitest to finish several seconds faster.

Differential Revision: https://phabricator.services.mozilla.com/D48517

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

dom/media/tests/mochitest/test_ondevicechange.html

@@ -13,7 +13,7 @@ createHTML({
   bug: "1152383"
 });
 
-const RESPONSE_WAIT_TIME_MS = 10000;
+const RESPONSE_WAIT_TIME_MS = 3000;
 
 function OnDeviceChangeEvent() {
   return new Promise(resolve => navigator.mediaDevices.ondevicechange = resolve);

dom/media/webrtc/MediaEngineWebRTC.cpp

@@ -21,7 +21,7 @@
 #include "nsITabSource.h"
 #include "prenv.h"
 
-#define FAKE_ONDEVICECHANGE_EVENT_PERIOD_IN_MS 5000
+#define FAKE_ONDEVICECHANGE_EVENT_PERIOD_IN_MS 500
 
 static mozilla::LazyLogModule sGetUserMediaLog("GetUserMedia");
 #undef LOG