Call super to remove the verify method

`SignedCookieJar`'s parse method already attempts to verify the message,
so we can just call super and try the old verifier if it fails.

actionpack/lib/action_dispatch/middleware/cookies.rb

@@ -510,7 +510,7 @@ def initialize(parent_jar)
 
       private
         def parse(name, signed_message)
-          deserialize name, verify(signed_message)
+          deserialize name, @verifier.verified(signed_message)
         end
 
         def commit(options)
@@ -518,12 +518,6 @@ def commit(options)
 
           raise CookieOverflow if options[:value].bytesize > MAX_COOKIE_SIZE
         end
-
-        def verify(signed_message)
-          @verifier.verify(signed_message)
-        rescue ActiveSupport::MessageVerifier::InvalidSignature
-          nil
-        end
     end
 
     # UpgradeLegacySignedCookieJar is used instead of SignedCookieJar if
@@ -535,7 +529,7 @@ class UpgradeLegacySignedCookieJar < SignedCookieJar #:nodoc:
 
       private
         def parse(name, signed_message)
-          deserialize(name, verify(signed_message)) || verify_and_upgrade_legacy_signed_message(name, signed_message)
+          super || verify_and_upgrade_legacy_signed_message(name, signed_message)
         end
     end