HasLocalBranches check is done by Gitaly only

Closes https://gitlab.com/gitlab-org/gitaly/issues/217

lib/gitlab/git/repository.rb

@@ -235,18 +235,6 @@ module Gitlab
       # This refs by default not visible in project page and not cloned to client side.
       alias_method :has_visible_content?, :has_local_branches?
 
-      def has_local_branches_rugged?
-        rugged.branches.each(:local).any? do |ref|
-          begin
-            ref.name && ref.target # ensures the branch is valid
-
-            true
-          rescue Rugged::ReferenceError
-            false
-          end
-        end
-      end
-
       # Returns the number of valid tags
       def tag_count
         gitaly_migrate(:tag_names) do |is_enabled|
@@ -1573,12 +1561,8 @@ module Gitlab
       private
 
       def uncached_has_local_branches?
-        gitaly_migrate(:has_local_branches, status: Gitlab::GitalyClient::MigrationStatus::OPT_OUT) do |is_enabled|
-          if is_enabled
+        wrapped_gitaly_errors do
           gitaly_repository_client.has_local_branches?
-          else
-            has_local_branches_rugged?
-          end
         end
       end
 

spec/lib/gitlab/git/repository_spec.rb

@@ -425,7 +425,7 @@ describe Gitlab::Git::Repository, seed_helper: true do
   end
 
   describe '#has_local_branches?' do
-    shared_examples 'check for local branches' do
+    context 'check for local branches' do
       it { expect(repository.has_local_branches?).to eq(true) }
 
       context 'mutable' do
@@ -459,14 +459,6 @@ describe Gitlab::Git::Repository, seed_helper: true do
         end
       end
     end
-
-    context 'with gitaly' do
-      it_behaves_like 'check for local branches'
-    end
-
-    context 'without gitaly', :skip_gitaly_mock do
-      it_behaves_like 'check for local branches'
-    end
   end
 
   describe "#delete_branch" do