Remove 'comment_on_any_diff_line' feature flag

app/controllers/projects/blob_controller.rb

@@ -122,7 +122,7 @@ class Projects::BlobController < Projects::ApplicationController
     @lines.map! do |line|
       # These are marked as context lines but are loaded from blobs.
       # We also have context lines loaded from diffs in other places.
-      diff_line = Gitlab::Diff::Line.new(line, expanded_diff_line_type, nil, nil, nil)
+      diff_line = Gitlab::Diff::Line.new(line, nil, nil, nil, nil)
       diff_line.rich_text = line
       diff_line
     end
@@ -132,11 +132,6 @@ class Projects::BlobController < Projects::ApplicationController
     render json: DiffLineSerializer.new.represent(@lines)
   end
 
-  def expanded_diff_line_type
-    # Context lines can't receive comments.
-    Feature.enabled?(:comment_in_any_diff_line, @project) ? nil : 'context'
-  end
-
   def add_match_line
     return unless @form.unfold?
 

spec/controllers/projects/blob_controller_spec.rb

@@ -141,28 +141,6 @@ describe Projects::BlobController do
           expect(lines.first).to have_key('rich_text')
         end
 
-        context 'comment in any diff line feature flag' do
-          it 'renders context lines when feature disabled' do
-            stub_feature_flags(comment_in_any_diff_line: false)
-
-            do_get(since: 1, to: 5, offset: 10, from_merge_request: true)
-            lines = JSON.parse(response.body)
-            all_context = lines.all? { |line| line['type'] == 'context' }
-
-            expect(all_context).to be(true)
-          end
-
-          it 'renders unchanged lines when feature enabled' do
-            stub_feature_flags(comment_in_any_diff_line: true)
-
-            do_get(since: 1, to: 5, offset: 10, from_merge_request: true)
-            lines = JSON.parse(response.body)
-            all_unchanged = lines.all? { |line| line['type'].nil? }
-
-            expect(all_unchanged).to be(true)
-          end
-        end
-
         context 'when rendering match lines' do
           it 'adds top match line when "since" is less than 1' do
             do_get(since: 5, to: 10, offset: 10, from_merge_request: true)