[epiphany] (7 commits) Non-fast-forward update to branch wip/exalm/gtk4

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/gtk4' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  79a3028... Stop using gtk_container_get_children() for GtkListBox and 
  5028e1b... search-engine-listbox: Don't subclass GtkListBox
  7328e5b... general-page: Stop using GtkFileChooserButton
  9d8e1f1... download: Stop using GtkFileChooserButton
  f14fd60... Prefer GFile-based GtkFileChooser API
  316bcbf... WIP: Port to GTK4

Commits added to the branch:

  646544c... Remove the valgrind instructions (*)
  9464fe0... Stop using gtk_container_get_children() for GtkListBox and  (*)
  0b51d2c... search-engine-listbox: Don't subclass GtkListBox (*)
  fb7e8fb... general-page: Stop using GtkFileChooserButton (*)
  31f937c... download: Stop using GtkFileChooserButton (*)
  aa14dca... Prefer GFile-based GtkFileChooser API (*)
  5801b64... WIP: Port to GTK4

(*) This commit already existed in another branch; no separate mail sent