Revert "Bug 1977393: Cancel non-completed downloads when the Download Service is killed r=android-reviewers,giorga" for causing Android build bustages @ AbstractFetchDownloadServiceTest
This reverts commit a487aac3c6ad3cbb8bb3bfe1eb2d893cce61f9c8.
Copyright (c) 2016 Alex CrichtonCopyright (c) 2017 The Tokio AuthorsPermission is hereby granted, free of charge, to anyperson obtaining a copy of this software and associateddocumentation files (the "Software"), to deal in theSoftware without restriction, including withoutlimitation the rights to use, copy, modify, merge,publish, distribute, sublicense, and/or sell copies ofthe Software, and to permit persons to whom the Softwareis furnished to do so, subject to the followingconditions:The above copyright notice and this permission noticeshall be included in all copies or substantial portionsof the Software.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OFANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITEDTO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR APARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENTSHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANYCLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTIONOF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF ORIN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHERDEALINGS IN THE SOFTWARE.