Reviewed by John Sullivan

        Do a more complete job adding the "WebArchiveDebugMode" pref

        * WebView/WebPreferences.m: Add both getter *and* setter
        (-[WebPreferences webArchiveDebugModeEnabled]):
        (-[WebPreferences setWebArchiveDebugModeEnabled:]):
        * WebView/WebPreferencesPrivate.h:

        * WebView/WebView.mm:
        (-[WebView _preferencesChangedNotification:]): Call the renamed getter



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31911 268f45cc-cd09-0410-ab3c-d52691b4dbfc