resources sidebar so other functions can easily trigger updates.

Reviewed by Adam Roben.

* page/inspector/ResourcesPanel.js:
(WebInspector.ResourcesPanel.prototype.addMessageToResource): Call updateErrorsAndWarnings.
Removes code that updates the bubbleText and class names.
(WebInspector.ResourcesPanel.prototype.clearMessages): Ditto.
(WebInspector.ResourceSidebarTreeElement.prototype.updateErrorsAndWarnings):
Added. Updates the bubbleText and adds or removes the class names
depending on if the values are zero.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31965 268f45cc-cd09-0410-ab3c-d52691b4dbfc