Unreviewed, reverting r263490@main.

https://bugs.webkit.org/show_bug.cgi?id=256160

triggers flaky incoming audio rendering

Reverted changeset:

"[GStreamer][MediaStream] Make the source element behave as a stream from urisourcebin scope"
https://bugs.webkit.org/show_bug.cgi?id=256042
https://commits.webkit.org/263490@main

Canonical link: https://commits.webkit.org/263548@main

Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.cpp

@@ -614,22 +614,21 @@ static void webkitMediaStreamSrcUriHandlerInit(gpointer gIface, gpointer)
 #define webkit_media_stream_src_parent_class parent_class
 WEBKIT_DEFINE_TYPE_WITH_CODE(WebKitMediaStreamSrc, webkit_media_stream_src, GST_TYPE_BIN, doInit)
 
-static void webkitMediaStreamSrcGetProperty(GObject* object, guint propertyId, GValue* value, GParamSpec* pspec)
+static void webkitMediaStreamSrcSetProperty(GObject* object, guint propertyId, const GValue*, GParamSpec* pspec)
 {
     switch (propertyId) {
-    case PROP_IS_LIVE: {
-        bool hasCaptureTrack = false;
-        auto* self = WEBKIT_MEDIA_STREAM_SRC_CAST(object);
-        for (auto& track : self->priv->tracks) {
-            if (track->isCaptureTrack()) {
-                hasCaptureTrack = true;
-                break;
-            }
-        }
-
-        g_value_set_boolean(value, hasCaptureTrack);
+    default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, propertyId, pspec);
         break;
     }
+}
+
+static void webkitMediaStreamSrcGetProperty(GObject* object, guint propertyId, GValue* value, GParamSpec* pspec)
+{
+    switch (propertyId) {
+    case PROP_IS_LIVE:
+        g_value_set_boolean(value, TRUE);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, propertyId, pspec);
         break;
@@ -746,6 +745,7 @@ static void webkit_media_stream_src_class_init(WebKitMediaStreamSrcClass* klass)
     gobjectClass->constructed = webkitMediaStreamSrcConstructed;
     gobjectClass->dispose = webkitMediaStreamSrcDispose;
     gobjectClass->get_property = webkitMediaStreamSrcGetProperty;
+    gobjectClass->set_property = webkitMediaStreamSrcSetProperty;
 
     g_object_class_install_property(gobjectClass, PROP_IS_LIVE, g_param_spec_boolean("is-live", nullptr, nullptr,
         TRUE, static_cast<GParamFlags>(G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));