Fixed rubocop, and moved `delta_size_check` to its own EE only module.

lib/ee/gitlab/deltas.rb

+module EE
+  module Gitlab
+    module Deltas
+      def self.delta_size_check(change, repo)
+        size_of_deltas = 0
+
+        begin
+          tree_a = repo.lookup(change[:oldrev])
+          tree_b = repo.lookup(change[:newrev])
+          diff = tree_a.diff(tree_b)
+
+          diff.each_delta do |d|
+            new_file_size = d.deleted? ? 0 : ::Gitlab::Git::Blob.raw(repo, d.new_file[:oid]).size
+
+            size_of_deltas += new_file_size
+          end
+
+          size_of_deltas
+        rescue Rugged::OdbError, Rugged::ReferenceError, Rugged::InvalidError
+          size_of_deltas
+        end
+      end
+    end
+  end
+end

lib/gitlab/git_access.rb

@@ -126,7 +126,7 @@ module Gitlab
         end
 
         if project.size_limit_enabled?
-          push_size_in_bytes += delta_size_check(change, project.repository)
+          push_size_in_bytes += EE::Gitlab::Deltas.delta_size_check(change, project.repository)
         end
       end
 
@@ -137,26 +137,6 @@ module Gitlab
       build_status_object(true)
     end
 
-    def delta_size_check(change, repo)
-      size_of_deltas = 0
-
-      begin
-        tree_a = repo.lookup(change[:oldrev])
-        tree_b = repo.lookup(change[:newrev])
-        diff = tree_a.diff(tree_b)
-
-        diff.each_delta do |d|
-          new_file_size = d.deleted? ? 0 : Gitlab::Git::Blob.raw(repo, d.new_file[:oid]).size
-
-          size_of_deltas += new_file_size
-        end
-
-        size_of_deltas
-      rescue Rugged::OdbError, Rugged::ReferenceError, Rugged::InvalidError
-        size_of_deltas
-      end
-    end
-
     def change_access_check(change)
       Checks::ChangeAccess.new(change, user_access: user_access, project: project).exec
     end
@@ -281,4 +261,4 @@ module Gitlab
       commit.refs(project.repository).any?
     end
   end
-end
\ No newline at end of file
+end