Prevent selecting a word in the breadcrumb or the styles section when double
        clicking on a DOM node in the outline tree.

        * page/inspector/DocumentPanel.js: Call preventDefault() when a mousedown event
          with a detail of 2 or higher comes in. This prevents the selection.
        * page/inspector/inspector.css: Mark the breadcrumb as user-select: none.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27735 268f45cc-cd09-0410-ab3c-d52691b4dbfc