Reviewed by Gustavo Noronha Silva.

        Deprecate the old loading signals load-started, load-committed,
        load-finished, load-progress-changed and change unit tests to use
        load-status instead.

        * tests/testmimehandling.c:
        (idle_quit_loop_cb):
        (test_mime_type): use notify::load-status
        * tests/testwebdatasource.c:
        (notify_load_status_unreachable_cb):
        (notify_load_status_cb):
        (test_webkit_web_data_source):
        (test_webkit_web_data_source_unreachable_uri): Remove uses of
        g_main_loop_is_running. It's an error if the loop is wrongly terminated.
        * tests/testwebresource.c:
        (notify_load_status_cb):
        (test_web_resource_loading):
        (notify_load_status_sub_cb):
        (test_web_resource_sub_resource_loading): use notify::load-status
        * tests/testwebview.c:
        (idle_quit_loop_cb):
        (test_webkit_web_view_icon_uri):
        * tests/testwindow.c:
        (notify_load_status_cb):
        (test_webkit_window_scrollbar_policy): use notify::load-status
        * webkit/webkitwebframe.cpp:
        (webkit_web_frame_class_init):
        * webkit/webkitwebview.cpp:
        (webkit_web_view_class_init): Deprecate old load signals.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@52215 268f45cc-cd09-0410-ab3c-d52691b4dbfc