[milo] {buildbucket,buildbot,swarming,logdog} -> backends/*.

milo/appengine/backends/swarming/html.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package swarming
 
 import (
         "errors"
         "fmt"
         "net/http"
@@ skipping 125 matching lines @@
         return http.StatusInternalServerError
 }
 
 // isAPINotFound returns true if err is a HTTP 404 API response.
 func isAPINotFound(err error) bool {
         if apiErr, ok := err.(*googleapi.Error); ok && apiErr.Code == http.StatusNotFound {
                 return true
         }
         return false
 }