match before appending to the passed in parent element.
This also prevents appending to the same parent element
multiple times.

Reviewed by John Sullivan.

* page/inspector/FontView.js:
(WebInspector.FontView.prototype.show): Pass the parent element to View.show.
* page/inspector/ResourceView.js: Optimize the attach method to no append if
there is a parentNode already.
* page/inspector/SourceView.js: Ditto.
* page/inspector/View.js: Call detach before appending if the parentNode
doesn't match the passed in element.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@33403 268f45cc-cd09-0410-ab3c-d52691b4dbfc