Reviewed by Pavel Feldman.

        Web Inspector: FontView needs Cleanup
        https://bugs.webkit.org/show_bug.cgi?id=38567

        FontView was missing some of the newer practices for initialization
        that other Resource Views had. Also its width calculations could
        result in a single character wrapping. This is general cleanup.

        * inspector/front-end/FontView.js:
        (WebInspector.FontView): move initialization into contentTabSelected
        (WebInspector.FontView.prototype.contentTabSelected): handle initialization like other Resource Views
        (WebInspector.FontView.prototype.updateFontPreviewSize): use a narrower width to prevent text from widowing

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@58805 268f45cc-cd09-0410-ab3c-d52691b4dbfc