[DevTools] Enable deleting of a snippet by pressing delete key

Source/devtools/front_end/SourcesNavigator.js

Index: Source/devtools/front_end/SourcesNavigator.js
diff --git a/Source/devtools/front_end/SourcesNavigator.js b/Source/devtools/front_end/SourcesNavigator.js
index 7fc40c885c0efc77ed07810bef91a05894226c16..e97420d0b42c36b99528b7a1854af3e6030bca76 100644
--- a/Source/devtools/front_end/SourcesNavigator.js
+++ b/Source/devtools/front_end/SourcesNavigator.js
@@ -231,5 +231,13 @@ WebInspector.SnippetsNavigatorView.prototype = {
         this.dispatchEventToListeners(WebInspector.NavigatorView.Events.ItemCreationRequested, data);
     },
 
+    /**
+     * @override
+     */
+    _sourceDeleted: function(uiSourceCode)
+    {
+        this._handleRemoveSnippet(uiSourceCode);
+    },
+
     __proto__: WebInspector.NavigatorView.prototype
 }