Remove rails-deprecated_sanitizer dependency

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Gemfile

 source 'https://rubygems.org'
 gem 'rails', '5.0.7.2'
-gem 'rails-deprecated_sanitizer', '~> 1.0.3'
 # Improves copy-on-write performance for MRI
 gem 'nakayoshi_fork', '~> 0.0.4'

Gemfile.lock

@@ -654,8 +654,6 @@ GEM
       actionpack (~> 5.x, >= 5.0.1)
       actionview (~> 5.x, >= 5.0.1)
       activesupport (~> 5.x)
-    rails-deprecated_sanitizer (1.0.3)
-      activesupport (>= 4.2.0.alpha)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
@@ -1111,7 +1109,6 @@ DEPENDENCIES
   rack-proxy (~> 0.6.0)
   rails (= 5.0.7.2)
   rails-controller-testing
-  rails-deprecated_sanitizer (~> 1.0.3)
   rails-i18n (~> 5.1)
   rainbow (~> 3.0)
   raindrops (~> 0.18)

app/controllers/projects/branches_controller.rb

@@ -53,7 +53,7 @@ class Projects::BranchesController < Projects::ApplicationController
   # rubocop: disable CodeReuse/ActiveRecord
   def create
-    branch_name = sanitize(strip_tags(params[:branch_name]))
+    branch_name = strip_tags(sanitize(params[:branch_name]))
     branch_name = Addressable::URI.unescape(branch_name)
     redirect_to_autodeploy = project.empty_repo? && project.deployment_platform.present?
@@ -122,7 +122,7 @@ class Projects::BranchesController < Projects::ApplicationController
   def ref
     if params[:ref]
-      ref_escaped = sanitize(strip_tags(params[:ref]))
+      ref_escaped = strip_tags(sanitize(params[:ref]))
       Addressable::URI.unescape(ref_escaped)
     else
       @project.default_branch || 'master'

app/helpers/markup_helper.rb

@@ -241,9 +241,7 @@ module MarkupHelper
       node.remove if node.name == 'a' && node.content.blank?
     end
-    # Use `Loofah` directly instead of `sanitize`
-    # as we still use the `rails-deprecated_sanitizer` gem
-    Loofah.fragment(text).scrub!(scrubber).to_s
+    sanitize text, scrubber: scrubber
   end
   def markdown_toolbar_button(options = {})

config/application.rb

@@ -164,8 +164,6 @@ module Gitlab
     # Version of your assets, change this if you want to expire all your assets
     config.assets.version = '1.0'
-    config.action_view.sanitized_allowed_protocols = %w(smb)
-
     # Can be removed once upgraded to Rails 5.1 or higher
     config.action_controller.raise_on_unfiltered_parameters = true