Remove unnecessary 'raw' alias

lib/gitlab/git/repository.rb

@@ -58,11 +58,6 @@ module Gitlab
         end
       end
-      # Alias to old method for compatibility
-      def raw
-        rugged
-      end
-
       def rugged
         @rugged ||= Rugged::Repository.new(path, alternates: alternate_object_directories)
       rescue Rugged::RepositoryError, Rugged::OSError

spec/lib/gitlab/git/commit_spec.rb

@@ -114,7 +114,7 @@ describe Gitlab::Git::Commit, seed_helper: true do
     describe '.find' do
       it "should return first head commit if without params" do
         expect(Gitlab::Git::Commit.last(repository).id).to eq(
-          repository.raw.head.target.oid
+          repository.rugged.head.target.oid
         )
       end

spec/lib/gitlab/git/repository_spec.rb

@@ -22,7 +22,6 @@ describe Gitlab::Git::Repository, seed_helper: true do
   describe "Respond to" do
     subject { repository }
-    it { is_expected.to respond_to(:raw) }
     it { is_expected.to respond_to(:rugged) }
     it { is_expected.to respond_to(:root_ref) }
     it { is_expected.to respond_to(:tags) }