Remove \OCP\App::register()

This method can be removed. This isn't used anymore since 4.5.0.

It's deprecated since mid 2012 e4679770c4

It doesn't do anything since mid 2012 8a92cd21d6

lib/public/app.php

@@ -41,18 +41,6 @@ namespace OCP;
  * @since 4.0.0
  */
 class App {
-	/**
-	 * Makes ownCloud aware of this app
-	 * @param array $data with all information
-	 * @return boolean
-	 *
-	 * @deprecated 4.5.0 This method is deprecated. Do not call it anymore.
-	 * It'll remain in our public API for compatibility reasons.
-	 *
-	 */
-	public static function register( $data ) {
-		return true; // don't do anything
-	}
 
 	/**
 	 * Adds an entry to the navigation