Remove protected_branch_creation feature flag

lib/gitlab/checks/branch_check.rb

@@ -48,7 +48,7 @@ module Gitlab
 
         if project.empty_repo?
           protected_branch_push_checks
-        elsif creation? && protected_branch_creation_enabled?
+        elsif creation?
           protected_branch_creation_checks
         elsif deletion?
           protected_branch_deletion_checks
@@ -124,10 +124,6 @@ module Gitlab
         Gitlab::Routing.url_helpers.project_project_members_url(project)
       end
 
-      def protected_branch_creation_enabled?
-        Feature.enabled?(:protected_branch_creation, project, default_enabled: true)
-      end
-
       def matching_merge_request?
         Checks::MatchingMergeRequest.new(newrev, branch_name, project).match?
       end

spec/lib/gitlab/checks/branch_check_spec.rb

@@ -77,37 +77,6 @@ describe Gitlab::Checks::BranchCheck do
         let(:oldrev) { '0000000000000000000000000000000000000000' }
         let(:ref) { 'refs/heads/feature' }
 
-        context 'protected branch creation feature is disabled' do
-          before do
-            stub_feature_flags(protected_branch_creation: false)
-          end
-
-          context 'user is not allowed to push to protected branch' do
-            before do
-              allow(user_access)
-                .to receive(:can_push_to_branch?)
-                .and_return(false)
-            end
-
-            it 'raises an error' do
-              expect { subject.validate! }.to raise_error(Gitlab::GitAccess::UnauthorizedError, 'You are not allowed to push code to protected branches on this project.')
-            end
-          end
-
-          context 'user is allowed to push to protected branch' do
-            before do
-              allow(user_access)
-                .to receive(:can_push_to_branch?)
-                .and_return(true)
-            end
-
-            it 'does not raise an error' do
-              expect { subject.validate! }.not_to raise_error
-            end
-          end
-        end
-
-        context 'protected branch creation feature is enabled' do
         context 'user can push to branch' do
           before do
             allow(user_access)
@@ -193,7 +162,6 @@ describe Gitlab::Checks::BranchCheck do
           end
         end
       end
-      end
 
       context 'branch deletion' do
         let(:newrev) { '0000000000000000000000000000000000000000' }