Inline the only call site of Mime::Type#browser_generated?

Signed-off-by: NMichael S. Klishin <michael@novemberain.com>

actionpack/lib/action_controller/mime_type.rb

@@ -191,17 +191,13 @@ def =~(mime_type)
     # Returns true if Action Pack should check requests using this Mime Type for possible request forgery.  See
     # ActionController::RequestForgeryProtection.
     def verify_request?
-      browser_generated?
+      @@browser_generated_types.include?(to_sym)
     end
 
     def html?
       @@html_types.include?(to_sym) || @string =~ /html/
     end
 
-    def browser_generated?
-      @@browser_generated_types.include?(to_sym)
-    end
-
     private
       def method_missing(method, *args)
         if method.to_s =~ /(\w+)\?$/