Removed duplicated JS hasVideoInputDeviceOnSystem() test helper

content/test/data/media/webrtc_test_utilities.js

Index: content/test/data/media/webrtc_test_utilities.js
diff --git a/content/test/data/media/webrtc_test_utilities.js b/content/test/data/media/webrtc_test_utilities.js
index d551b8a128906c1c54901e292ea26aff1064f3c3..aa11a975912478108af4879dd16c6d35000788fe 100644
--- a/content/test/data/media/webrtc_test_utilities.js
+++ b/content/test/data/media/webrtc_test_utilities.js
@@ -263,19 +263,3 @@ function assertTrue(booleanExpression, description) {
   }
 }
 
-// Returns has-video-input-device to the test if there's a webcam available on
-// the system.
-function hasVideoInputDeviceOnSystem() {
-  MediaStreamTrack.getSources(function(devices) {
-    var hasVideoInputDevice = false;
-    devices.forEach(function(device) {
-      if (device.kind == 'video')
-        hasVideoInputDevice = true;
-    });
-
-    if (hasVideoInputDevice)
-      sendValueToTest('has-video-input-device');
-    else
-      sendValueToTest('no-video-input-devices');
-  });
-}