Fix incorrect parameter used for self object (#22135)

Fix incorrect parameter used for self object

Rename the GWeakNotify function parameters.
This matches the prototype and makes it harder to accidentally use the object
parameter the wrong way.

shell/platform/linux/fl_binary_messenger.cc

@@ -100,7 +100,8 @@ static void platform_message_handler_free(gpointer data) {
   g_free(self);
 }
 
-static void engine_weak_notify_cb(gpointer user_data, GObject* object) {
+static void engine_weak_notify_cb(gpointer user_data,
+                                  GObject* where_the_object_was) {
   FlBinaryMessenger* self = FL_BINARY_MESSENGER(user_data);
   self->engine = nullptr;
 

shell/platform/linux/fl_engine.cc

@@ -152,7 +152,8 @@ static gboolean flutter_source_dispatch(GSource* source,
 }
 
 // Called when the engine is disposed.
-static void engine_weak_notify_cb(gpointer user_data, GObject* object) {
+static void engine_weak_notify_cb(gpointer user_data,
+                                  GObject* where_the_object_was) {
   FlutterSource* source = reinterpret_cast<FlutterSource*>(user_data);
   source->engine = nullptr;
   g_source_destroy(reinterpret_cast<GSource*>(source));

shell/platform/linux/fl_mouse_cursor_plugin.cc

@@ -140,8 +140,9 @@ static void method_call_cb(FlMethodChannel* channel,
   }
 }
 
-static void view_weak_notify_cb(gpointer user_data, GObject* object) {
-  FlMouseCursorPlugin* self = FL_MOUSE_CURSOR_PLUGIN(object);
+static void view_weak_notify_cb(gpointer user_data,
+                                GObject* where_the_object_was) {
+  FlMouseCursorPlugin* self = FL_MOUSE_CURSOR_PLUGIN(user_data);
   self->view = nullptr;
 }
 

shell/platform/linux/fl_plugin_registrar.cc

@@ -22,7 +22,8 @@ G_MODULE_EXPORT GType fl_plugin_registrar_get_type();
 
 G_DEFINE_TYPE(FlPluginRegistrar, fl_plugin_registrar, G_TYPE_OBJECT)
 
-static void view_weak_notify_cb(gpointer user_data, GObject* object) {
+static void view_weak_notify_cb(gpointer user_data,
+                                GObject* where_the_object_was) {
   FlPluginRegistrar* self = FL_PLUGIN_REGISTRAR(user_data);
   self->view = nullptr;
 }