Removed duplicated method find_root_with_flag

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

railties/lib/rails/engine.rb

@@ -343,21 +343,6 @@ def inherited(base)
         super
       end
 
-      def find_root_with_flag(flag, default=nil)
-        root_path = self.called_from
-
-        while root_path && File.directory?(root_path) && !File.exist?("#{root_path}/#{flag}")
-          parent = File.dirname(root_path)
-          root_path = parent != root_path && parent
-        end
-
-        root = File.exist?("#{root_path}/#{flag}") ? root_path : default
-        raise "Could not find root path for #{self}" unless root
-
-        RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ?
-          Pathname.new(root).expand_path : Pathname.new(root).realpath
-      end
-
       def endpoint(endpoint = nil)
         @endpoint = endpoint if endpoint
         @endpoint