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This reverts commit 220c3a64.

Reason for revert: DownloadTaskImplTest.* are failing again on iOS 11 devices:

For example:

DownloadTaskImplTest.FailureInTheBeginning:
../../ios/web/download/download_task_impl_unittest.mm:321: Failure
Value of: session_task
  Actual: false
Expected: true
../../ios/web/download/download_task_impl_unittest.mm:319: Failure
Actual function call count doesn't match EXPECT_CALL(task_observer_, OnDownloadUpdated(task_.get()))...
         Expected: to be called once
           Actual: never called - unsatisfied and active
unknown file: Failure
Uninteresting mock function call - returning directly.
    Function call: OnTaskDestroyed(0x101752170)

Original change's description:
> Reland DownloadTaskImpl implementation for //ios/web Download API.
> 
> This CL implements DownloadTask public interface.
> 
> DownloadControllerImpl CL: crrev.com/c/758525
> Design doc: http://go/ios-web-download-api
> 
> Bug: 780646
> Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
> Change-Id: Iffea44bfb64cc945f7d899dd7181556a730394f1
> Reviewed-on: https://chromium-review.googlesource.com/775889
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Commit-Queue: Eugene But <eugenebut@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#517424}

TBR=sdefresne@chromium.org,eugenebut@chromium.org

Change-Id: I254a9d8856c29bbe228a2dc96838536dd23e5a35
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 780646
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/777063Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517485}