[epiphany] (10 commits) Non-fast-forward update to branch mcatanzaro/#1800

[Michael Catanzaro <mcatanzaro src gnome org>]

The branch 'mcatanzaro/#1800' 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:

  3fe33f6... window-commands: fix warning when opening import dialog
  4c9e0ab... Fix crashes and misbehavior when importing bookmarks

Commits added to the branch:

  4228d3f... ephy_shell_new_tab_full: Support NULL window (*)
  71bca8c... WebExtensions: Stub out tabs events (*)
  c7d79ee... WebExtensions: Implement tabs.create() (*)
  9d42e89... WebExtensions: Implement tabs.remove() (*)
  9eaf507... WebExtensions: Implement tabs.getZoom() and tabs.setZoom() (*)
  e978210... WebExtensions: Implement tabs.getCurrent() (*)
  5c210f4... WebExtensions: Implement tabs.update() (*)
  9f3f40d... WebExtensions: Implement getting return value for tabs.exec (*)
  19fde7f... window-commands: fix warning when opening import dialog
  5b14304... Fix crashes and misbehavior when importing bookmarks

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