Bug 1573100 - Remove unused WebConsole:setFilterState. r=Honza.

Differential Revision: https://phabricator.services.mozilla.com/D42298

--HG--
extra : moz-landing-system : lando

devtools/client/webconsole/webconsole.js

@@ -149,14 +149,6 @@ class WebConsole {
     this.jsterm._setValue(newValue);
   }
 
-  /**
-   * Alias for the WebConsoleUI.setFilterState() method.
-   * @see webconsole.js::WebConsoleUI.setFilterState()
-   */
-  setFilterState() {
-    this.ui && this.ui.setFilterState.apply(this.ui, arguments);
-  }
-
   /**
    * Open a link in a new tab.
    *