Add `Style/RedundantFreeze` to remove redudant `.freeze`

Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.

* Exclude these files not to auto correct false positive `Regexp#freeze`
 - 'actionpack/lib/action_dispatch/journey/router/utils.rb'
 - 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'

It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.

* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required

 - 'actionpack/test/controller/test_case_test.rb'
 - 'activemodel/test/cases/type/string_test.rb'
 - 'activesupport/lib/active_support/core_ext/string/strip.rb'
 - 'activesupport/test/core_ext/string_ext_test.rb'
 - 'railties/test/generators/actions_test.rb'

1 files changed, 7 insertions, 7 deletions

diff --git a/actionpack/lib/action_dispatch/http/content_security_policy.rb b/actionpack/lib/action_dispatch/http/content_security_policy.rb
index 855be5ce2e..50953e32b5 100644
--- a/actionpack/lib/action_dispatch/http/content_security_policy.rb
+++ b/actionpack/lib/action_dispatch/http/content_security_policy.rb
@@ -5,9 +5,9 @@ require "active_support/core_ext/object/deep_dup"
 module ActionDispatch #:nodoc:
   class ContentSecurityPolicy
     class Middleware
-      CONTENT_TYPE = "Content-Type".freeze
-      POLICY = "Content-Security-Policy".freeze
-      POLICY_REPORT_ONLY = "Content-Security-Policy-Report-Only".freeze
+      CONTENT_TYPE = "Content-Type"
+      POLICY = "Content-Security-Policy"
+      POLICY_REPORT_ONLY = "Content-Security-Policy-Report-Only"
 
       def initialize(app)
         @app = app
@@ -50,10 +50,10 @@ module ActionDispatch #:nodoc:
     end
 
     module Request
-      POLICY = "action_dispatch.content_security_policy".freeze
-      POLICY_REPORT_ONLY = "action_dispatch.content_security_policy_report_only".freeze
-      NONCE_GENERATOR = "action_dispatch.content_security_policy_nonce_generator".freeze
-      NONCE = "action_dispatch.content_security_policy_nonce".freeze
+      POLICY = "action_dispatch.content_security_policy"
+      POLICY_REPORT_ONLY = "action_dispatch.content_security_policy_report_only"
+      NONCE_GENERATOR = "action_dispatch.content_security_policy_nonce_generator"
+      NONCE = "action_dispatch.content_security_policy_nonce"
 
       def content_security_policy
         get_header(POLICY)