Don't eject cassettes on UnhandledHTTPRequestError (vcr#555)

VCR.cassettes was once private but is now public so this code can be
removed. Ejecting the cassettes is generally harmless but causes any
subsequent network requests to fail (e.g. in RSpec after hooks).

Author: hdabrows

lib/vcr/errors.rb

@@ -88,18 +88,7 @@ def construct_message
       end
 
       def current_cassettes
-        @cassettes ||= begin
-          cassettes = VCR.cassettes.to_a.reverse
-
-          begin
-            loop do
-              break unless VCR.eject_cassette
-            end
-          rescue EjectLinkedCassetteError
-          end
-
-          cassettes
-        end
+        @cassettes ||= VCR.cassettes.to_a.reverse
       end
 
       def request_description