Enable the Rubocop DeprecatedClassMethods cop

This reports uses of `File.exists?` and `Dir.exists?`, which were both
deprecated in Ruby and will eventually be removed in favor of
`.exist?`. Also fixes all existing uses of the deprecated methods.

2 files changed, 2 insertions, 2 deletions

diff --git a/app/models/ci/build.rb b/app/models/ci/build.rb
index 4bc3a225e2c..073ec9dd89e 100644
--- a/app/models/ci/build.rb
+++ b/app/models/ci/build.rb
@@ -238,7 +238,7 @@ module Ci
     end
 
     def recreate_trace_dir
-      unless Dir.exists?(dir_to_trace)
+      unless Dir.exist?(dir_to_trace)
         FileUtils.mkdir_p(dir_to_trace)
       end
     end
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 4175e1e5fba..365ccc90b40 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -544,7 +544,7 @@ class MergeRequest < ActiveRecord::Base
   end
 
   def ref_is_fetched?
-    File.exists?(File.join(project.repository.path_to_repo, ref_path))
+    File.exist?(File.join(project.repository.path_to_repo, ref_path))
   end
 
   def ensure_ref_fetched