Revert of Last_n: instrumentation tests to verify timely snapshot deletion.

Revert of Last_n: instrumentation tests to verify timely snapshot deletion. (patchset #7 id:120001 of https://codereview.chromium.org/2833653002/ )

Reason for revert:
Likely cause of https://crbug.com/746699.

testLastNPageIsDeletedUponNavigation is flaky.

Original issue's description:
> Last_n: instrumentation tests to verify timely snapshot deletion.
> 
> Adds new tests to RecentTabsTest.java to verify that offline snapshots created
> by last_n are properly deleted when successfully navigating to another page and
> upon tab closure. These actions are important to comply with privacy
> requirements for this feature.
> 
> This change re-adds instrumentation tests previously committed along with a
> related bugfix [1] that were reverted due to them being flaky. It seems that the
> underlying issue causing the flakyness has been fixed [2] [3] so these should
> now work as expected.
> 
> [1] https://codereview.chromium.org/2824623002/
> [2] https://bugs.chromium.org/p/chromium/issues/detail?id=592961 (restricted)
> [3] https://bugs.chromium.org/p/chromium/issues/detail?id=738490
> 
> BUG=711770
> 
> Review-Url: https://codereview.chromium.org/2833653002
> Cr-Commit-Position: refs/heads/master@{#487727}
> Committed: https://chromium.googlesource.com/chromium/src/+/f6fd25d5826f1a62010b08037eb50c396b05d7a2

TBR=dewittj@chromium.org,carlosk@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=711770
Review-Url: https://codereview.chromium.org/2983953002
Cr-Commit-Position: refs/heads/master@{#488195}
Committed: https://chromium.googlesource.com/chromium/src/+/3455deb988f259fde5248f926196057fa19bcb4e

[jdoerrie, 2017-07-20 09:47:29]

The CQ bit was checked by jdoerrie@chromium.org

[jdoerrie, 2017-07-20 09:47:30]

Created Revert of Last_n: instrumentation tests to verify timely snapshot
deletion.

[commit-bot: I haz the power, 2017-07-20 09:47:34]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-07-20 11:24:35]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1500544049772330, "parent_rev":
"e5f0bba357440191809c661465aab4d3caca13a2", "commit_rev":
"3455deb988f259fde5248f926196057fa19bcb4e"}

[commit-bot: I haz the power, 2017-07-20 11:24:49]

Description was changed from

==========
Revert of Last_n: instrumentation tests to verify timely snapshot deletion.
(patchset #7 id:120001 of https://codereview.chromium.org/2833653002/ )

Reason for revert:
Likely cause of https://crbug.com/746699.

testLastNPageIsDeletedUponNavigation is flaky.

Original issue's description:
> Last_n: instrumentation tests to verify timely snapshot deletion.
> 
> Adds new tests to RecentTabsTest.java to verify that offline snapshots created
> by last_n are properly deleted when successfully navigating to another page
and
> upon tab closure. These actions are important to comply with privacy
> requirements for this feature.
> 
> This change re-adds instrumentation tests previously committed along with a
> related bugfix [1] that were reverted due to them being flaky. It seems that
the
> underlying issue causing the flakyness has been fixed [2] [3] so these should
> now work as expected.
> 
> [1] https://codereview.chromium.org/2824623002/
> [2] https://bugs.chromium.org/p/chromium/issues/detail?id=592961 (restricted)
> [3] https://bugs.chromium.org/p/chromium/issues/detail?id=738490
> 
> BUG=711770
> 
> Review-Url: https://codereview.chromium.org/2833653002
> Cr-Commit-Position: refs/heads/master@{#487727}
> Committed:
https://chromium.googlesource.com/chromium/src/+/f6fd25d5826f1a62010b08037eb5...

TBR=dewittj@chromium.org,carlosk@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=711770
==========

to

==========
Revert of Last_n: instrumentation tests to verify timely snapshot deletion.
(patchset #7 id:120001 of https://codereview.chromium.org/2833653002/ )

Reason for revert:
Likely cause of https://crbug.com/746699.

testLastNPageIsDeletedUponNavigation is flaky.

Original issue's description:
> Last_n: instrumentation tests to verify timely snapshot deletion.
> 
> Adds new tests to RecentTabsTest.java to verify that offline snapshots created
> by last_n are properly deleted when successfully navigating to another page
and
> upon tab closure. These actions are important to comply with privacy
> requirements for this feature.
> 
> This change re-adds instrumentation tests previously committed along with a
> related bugfix [1] that were reverted due to them being flaky. It seems that
the
> underlying issue causing the flakyness has been fixed [2] [3] so these should
> now work as expected.
> 
> [1] https://codereview.chromium.org/2824623002/
> [2] https://bugs.chromium.org/p/chromium/issues/detail?id=592961 (restricted)
> [3] https://bugs.chromium.org/p/chromium/issues/detail?id=738490
> 
> BUG=711770
> 
> Review-Url: https://codereview.chromium.org/2833653002
> Cr-Commit-Position: refs/heads/master@{#487727}
> Committed:
https://chromium.googlesource.com/chromium/src/+/f6fd25d5826f1a62010b08037eb5...

TBR=dewittj@chromium.org,carlosk@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=711770

Review-Url: https://codereview.chromium.org/2983953002
Cr-Commit-Position: refs/heads/master@{#488195}
Committed:
https://chromium.googlesource.com/chromium/src/+/3455deb988f259fde5248f926196...
==========

[commit-bot: I haz the power, 2017-07-20 11:24:50]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3455deb988f259fde5248f926196...