[GTK] Build fix for debug build

Unreviewed.

finalizedListItem was actually used in ASSERT.  So, use ASSERT_UNUSED
instead of ASSERT.

* UIProcess/API/gtk/WebKitBackForwardListItem.cpp:
(webkitBackForwardListItemFinalized):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@165799 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Revert the erroneous change made by Xcode.

* WebKit.xcodeproj/project.pbxproj:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@165800 268f45cc-cd09-0410-ab3c-d52691b4dbfc