[Downloads] Simplify DownloadContentTests.

[Downloads] Simplify DownloadContentTests.

There used to be two download resumption code paths. DownloadItemImpl
chose the applicable code path based on whether the WebContents that
initiated the download was still around. Now DownloadItemImpl
deterministically uses the no-WebContents code path. Hence the
parameterized tests that exercised both paths no longer need to do so.

BUG=7648
Committed: https://crrev.com/4faa7714d832789e56fc2064ac86e3af61557bee
Cr-Commit-Position: refs/heads/master@{#379026}

[asanka, 2016-03-03 16:44:49]

asanka@chromium.org changed reviewers:
+ svaldez@chromium.org

[svaldez, 2016-03-03 16:54:55]

lgtm.

[asanka, 2016-03-03 16:55:37]

The CQ bit was checked by asanka@chromium.org

[commit-bot: I haz the power, 2016-03-03 16:55:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1754703007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1754703007/1

[commit-bot: I haz the power, 2016-03-03 17:18:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-03 17:20:50]

Description was changed from

==========
[Downloads] Simplify DownloadContentTests.

There used to be two download resumption code paths. DownloadItemImpl
chose the applicable code path based on whether the WebContents that
initiated the download was still around. Now DownloadItemImpl
deterministically uses the no-WebContents code path. Hence the
parameterized tests that exercised both paths no longer need to do so.

BUG=7648
==========

to

==========
[Downloads] Simplify DownloadContentTests.

There used to be two download resumption code paths. DownloadItemImpl
chose the applicable code path based on whether the WebContents that
initiated the download was still around. Now DownloadItemImpl
deterministically uses the no-WebContents code path. Hence the
parameterized tests that exercised both paths no longer need to do so.

BUG=7648

Committed: https://crrev.com/4faa7714d832789e56fc2064ac86e3af61557bee
Cr-Commit-Position: refs/heads/master@{#379026}
==========

[commit-bot: I haz the power, 2016-03-03 17:20:50]

Patchset 1 (id:??) landed as
https://crrev.com/4faa7714d832789e56fc2064ac86e3af61557bee
Cr-Commit-Position: refs/heads/master@{#379026}