Reviewed by Alexy Proskuryakov.  Patch by Mark Rowe.

        Bug 9692: Warning about Safari extensions on every launch is obnoxious
        http://bugzilla.opendarwin.org/show_bug.cgi?id=9692

        * WebKitLauncher/WebKitNightlyEnabler.m:
        (myApplicationWillTerminate): Note that we are exiting cleanly.
        (cleanUpAfterOurselves): Install bundle load tracking only if we failed
         to exit cleanly on our last invocation.  This doesn't play nicely with
         multiple concurrent instances of WebKit.app so it can be disabled via
         defaults write com.apple.Safari WKNEShouldMonitorShutdowns -bool NO.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15138 268f45cc-cd09-0410-ab3c-d52691b4dbfc