Bug 9631: [Drosera] Add "Step Over" and "Step Out"
        http://bugzilla.opendarwin.org/show_bug.cgi?id=9631
        
        Adds step over and step out. Along with a little code cleanup
        that was minor enough to piggyback on this fix.

        * Drosera/DebuggerDocument.h:
        * Drosera/DebuggerDocument.m:
        (-[DebuggerDocument stepOver:]):
        (-[DebuggerDocument stepOut:]):
        (-[DebuggerDocument windowDidLoad]):
        (-[DebuggerDocument windowWillClose:]):
        (-[DebuggerDocument toolbar:itemForItemIdentifier:willBeInsertedIntoToolbar:]):
        (-[DebuggerDocument toolbarDefaultItemIdentifiers:]):
        (-[DebuggerDocument toolbarAllowedItemIdentifiers:]):
        (-[DebuggerDocument validateUserInterfaceItem:]):
        * Drosera/Drosera.xcodeproj/project.pbxproj:
        * Drosera/debugger.html:
        * Drosera/debugger.js:
        * Drosera/viewer.css:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15144 268f45cc-cd09-0410-ab3c-d52691b4dbfc