Web Inspector: [Extensions API][refactoring] remove dependencies on the ExtensionsSer...

Web Inspector: [Extensions API][refactoring] remove dependencies on the ExtensionsServer from most of the insepctor
https://bugs.webkit.org/show_bug.cgi?id=72899

Reviewed by Pavel Feldman.

* inspector/front-end/ElementsPanel.js:
(WebInspector.ElementsPanel.prototype._selectedNodeChanged):
* inspector/front-end/ExtensionServer.js:
(WebInspector.ExtensionServer.prototype._notifyResourceContentCommitted):
(WebInspector.ExtensionServer.prototype._notifyElementsSelectionChanged):
* inspector/front-end/Resource.js:
(WebInspector.Resource.prototype.addRevision):
* inspector/front-end/externs.js:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@100994 268f45cc-cd09-0410-ab3c-d52691b4dbfc