Remove unused (?) code

lib/gitlab/diff/file.rb

@@ -79,13 +79,6 @@ module Gitlab
         @new_content_sha = refs&.head_sha
       end
-      def new_content_commit
-        return @new_content_commit if defined?(@new_content_commit)
-
-        sha = new_content_commit
-        @new_content_commit = repository.commit(sha) if sha
-      end
-
       def old_content_sha
         return if new_file?
         return @old_content_sha if defined?(@old_content_sha)
@@ -94,13 +87,6 @@ module Gitlab
         @old_content_sha = refs&.base_sha
       end
-      def old_content_commit
-        return @old_content_commit if defined?(@old_content_commit)
-
-        sha = old_content_sha
-        @old_content_commit = repository.commit(sha) if sha
-      end
-
       def new_blob
         return @new_blob if defined?(@new_blob)
@@ -123,10 +109,6 @@ module Gitlab
         new_content_sha || old_content_sha
       end
-      def content_commit
-        new_content_commit || old_content_commit
-      end
-
       def blob
         new_blob || old_blob
       end

spec/lib/gitlab/diff/file_spec.rb

@@ -47,14 +47,6 @@ describe Gitlab::Diff::File do
     end
   end
-  describe '#old_content_commit' do
-    it 'returns base commit' do
-      old_content_commit = diff_file.old_content_commit
-
-      expect(old_content_commit.id).to eq('6f6d7e7ed97bb5f0054f2b1df789b39ca89b6ff9')
-    end
-  end
-
   describe '#old_blob' do
     it 'returns blob of commit of base commit' do
       old_data = diff_file.old_blob.data