Fix lint error.

Author: fnando

lib/browser/testing.rb

@@ -16,9 +16,9 @@ def self.bot_user_agents
   end
 
   def self.search_engine_user_agents
-    @search_engine_user_agents ||= begin
-      YAML.load_file(Browser.root.join("test/ua_search_engines.yml"))
-    end
+    @search_engine_user_agents ||= YAML.load_file(
+      Browser.root.join("test/ua_search_engines.yml")
+    )
   end
 
   def self.[](key)