Web Inspector: Implement snippets removing.

Web Inspector: Implement snippets removing.
https://bugs.webkit.org/show_bug.cgi?id=90674

Reviewed by Pavel Feldman.

* inspector/front-end/NavigatorView.js:
(WebInspector.NavigatorView.prototype.rename.afterEditing):
* inspector/front-end/ScriptsNavigator.js:
(WebInspector.ScriptsNavigator.prototype.removeUISourceCode):
(WebInspector.SnippetsNavigatorView.prototype._handleRemoveSnippet):
* inspector/front-end/ScriptsPanel.js:
(WebInspector.ScriptsPanel.prototype._addUISourceCode):
(WebInspector.ScriptsPanel.prototype._uiSourceCodeRemoved):
(WebInspector.ScriptsPanel.prototype._revealExecutionLine):
* inspector/front-end/TabbedEditorContainer.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121955 268f45cc-cd09-0410-ab3c-d52691b4dbfc