Removed Project#discover_default_branch since it not needed any more

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/contexts/projects/create_context.rb

@@ -47,8 +47,6 @@ module Projects
       @project.creator = current_user
 
       if @project.save
-        @project.discover_default_branch
-
         unless @project.group
           @project.users_projects.create(
             project_access: UsersProject::MASTER,

app/controllers/projects_controller.rb

@@ -62,10 +62,6 @@ class ProjectsController < ApplicationController
     @events = event_filter.apply_filter(@events)
     @events = @events.limit(limit).offset(params[:offset] || 0)
 
-    # Ensure project default branch is set if it possible
-    # Normally it defined on push or during creation
-    @project.discover_default_branch
-
     respond_to do |format|
       format.html do
         if @project.empty_repo?

app/models/project.rb

@@ -302,14 +302,6 @@ class Project < ActiveRecord::Base
     end
   end
 
-  def discover_default_branch
-    # Discover the default branch, but only if it hasn't already been set to
-    # something else
-    if repository.exists? && default_branch.nil?
-      update_attributes(default_branch: self.repository.discover_default_branch)
-    end
-  end
-
   def update_merge_requests(oldrev, newrev, ref, user)
     return true unless ref =~ /heads/
     branch_name = ref.gsub("refs/heads/", "")

app/services/git_push_service.rb

@@ -24,7 +24,6 @@ class GitPushService
     create_push_event
 
     project.ensure_satellite_exists
-    project.discover_default_branch
     project.repository.expire_cache
 
     if push_to_existing_branch?(ref, oldrev)

app/workers/repository_import_worker.rb

@@ -14,7 +14,6 @@ class RepositoryImportWorker
       project.imported = true
       project.save
       project.satellite.create unless project.satellite.exists?
-      project.discover_default_branch
     else
       project.imported = false
     end