Deduplicate protected ref human_access_levels

Previously these were duplicated so they could be different for push/merge,
but this was no longer necessary after
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11232

app/controllers/projects/settings/repository_controller.rb

@@ -21,14 +21,14 @@ module Projects
 
       def access_levels_options
         {
-          create_access_levels: levels_for_dropdown(ProtectedTag::CreateAccessLevel),
-          push_access_levels: levels_for_dropdown(ProtectedBranch::PushAccessLevel),
-          merge_access_levels: levels_for_dropdown(ProtectedBranch::MergeAccessLevel)
+          create_access_levels: levels_for_dropdown,
+          push_access_levels: levels_for_dropdown,
+          merge_access_levels: levels_for_dropdown
         }
       end
 
-      def levels_for_dropdown(access_level_type)
-        roles = access_level_type.human_access_levels.map do |id, text|
+      def levels_for_dropdown
+        roles = ProtectedRefAccess::HUMAN_ACCESS_LEVELS.map do |id, text|
           { id: id, text: text, before_divider: true }
         end
         { roles: roles }

app/models/concerns/protected_branch_access.rb

@@ -8,14 +8,6 @@ module ProtectedBranchAccess
 
     delegate :project, to: :protected_branch
 
-    def self.human_access_levels
-      {
-        Gitlab::Access::MASTER => "Masters",
-        Gitlab::Access::DEVELOPER => "Developers + Masters",
-        Gitlab::Access::NO_ACCESS => "No one"
-      }.with_indifferent_access
-    end
-
     def check_access(user)
       return false if access_level == Gitlab::Access::NO_ACCESS
 

app/models/concerns/protected_ref_access.rb

@@ -7,6 +7,12 @@ module ProtectedRefAccess
     Gitlab::Access::NO_ACCESS
   ].freeze
 
+  HUMAN_ACCESS_LEVELS = {
+    Gitlab::Access::MASTER => "Masters".freeze,
+    Gitlab::Access::DEVELOPER => "Developers + Masters".freeze,
+    Gitlab::Access::NO_ACCESS => "No one".freeze
+  }.freeze
+
   included do
     scope :master, -> { where(access_level: Gitlab::Access::MASTER) }
     scope :developer, -> { where(access_level: Gitlab::Access::DEVELOPER) }
@@ -17,7 +23,7 @@ module ProtectedRefAccess
   end
 
   def humanize
-    self.class.human_access_levels[self.access_level]
+    HUMAN_ACCESS_LEVELS[self.access_level]
   end
 
   # CE access levels are always role-based,

app/models/protected_tag/create_access_level.rb

 class ProtectedTag::CreateAccessLevel < ActiveRecord::Base
   include ProtectedTagAccess
 
-  def self.human_access_levels
-    {
-      Gitlab::Access::MASTER => "Masters",
-      Gitlab::Access::DEVELOPER => "Developers + Masters",
-      Gitlab::Access::NO_ACCESS => "No one"
-    }.with_indifferent_access
-  end
-
   def check_access(user)
     return false if access_level == Gitlab::Access::NO_ACCESS
 

spec/support/protected_tags/access_control_ce_shared_examples.rb

 RSpec.shared_examples "protected tags > access control > CE" do
-  ProtectedTag::CreateAccessLevel.human_access_levels.each do |(access_type_id, access_type_name)|
+  ProtectedRefAccess::HUMAN_ACCESS_LEVELS.each do |(access_type_id, access_type_name)|
     it "allows creating protected tags that #{access_type_name} can create" do
       visit project_protected_tags_path(project)
 

spec/support/shared_examples/features/protected_branches_access_control_ce.rb

 shared_examples "protected branches > access control > CE" do
-  ProtectedBranch::PushAccessLevel.human_access_levels.each do |(access_type_id, access_type_name)|
+  ProtectedRefAccess::HUMAN_ACCESS_LEVELS.each do |(access_type_id, access_type_name)|
     it "allows creating protected branches that #{access_type_name} can push to" do
       visit project_protected_branches_path(project)
 
@@ -44,7 +44,7 @@ shared_examples "protected branches > access control > CE" do
     end
   end
 
-  ProtectedBranch::MergeAccessLevel.human_access_levels.each do |(access_type_id, access_type_name)|
+  ProtectedRefAccess::HUMAN_ACCESS_LEVELS.each do |(access_type_id, access_type_name)|
     it "allows creating protected branches that #{access_type_name} can merge to" do
       visit project_protected_branches_path(project)