Revert "ephy-title-box: Fix a type"

This reverts commit 5c8005ec5adb1b9432d3390e73de5213899502cb.

https://bugzilla.gnome.org/show_bug.cgi?id=732784
Revert "ephy-title-box: Fix a warning when closing window"

This reverts commit 7eabfe44e9804717bfb6f0fa10e53f9c4d170e38.

https://bugzilla.gnome.org/show_bug.cgi?id=732784
Revert "ephy-title-box: Fix crash when closing second window"

This reverts commit 005ce536fd94db9fca3906a358ca555a3e557771.

https://bugzilla.gnome.org/show_bug.cgi?id=732784
ephy-title-box: Fix crash when closing second window

The web view can be destroyed out from under us, so we need to use a
weak reference to determine if it is still alive.

https://bugzilla.gnome.org/show_bug.cgi?id=732784