Revert of Track task ids for navigations cross multiple tabs.

Revert of Track task ids for navigations cross multiple tabs. (patchset #4 id:80001 of https://codereview.chromium.org/2868043003/ )

Reason for revert:
crbug.com/725026 and crbug.com/724497

Original issue's description:
> Track task ids for navigations cross multiple tabs.
> 
> This is a following step to generate task ids for navigations. Now we
> can track navigation relationship cross multiple tabs. If navigation B
> in tab2 is clicked from navigation A in tab1, then navigation A is B's
> parent task. And this is generalized to more than 2 tabs.
> 
> BUG=707978
> R=zea@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2868043003
> Cr-Commit-Position: refs/heads/master@{#472667}
> Committed: https://chromium.googlesource.com/chromium/src/+/854b8bcfc787413293c86eddd979a3fd1936fb1a

TBR=shenchao@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=707978
Review-Url: https://codereview.chromium.org/2901533003
Cr-Commit-Position: refs/heads/master@{#473790}
Committed: https://chromium.googlesource.com/chromium/src/+/7e3869bafd618a75247cd2082e6e72343425ec7e

[Nicolas Zea, 2017-05-23 01:25:12]

The CQ bit was checked by zea@chromium.org

[Nicolas Zea, 2017-05-23 01:25:13]

Created Revert of Track task ids for navigations cross multiple tabs.

[commit-bot: I haz the power, 2017-05-23 01:25:38]

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, 2017-05-23 02:51:56]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1495502712993690, "parent_rev":
"007ec6f38ea45bdb1f6adccb088fabc61c34670c", "commit_rev":
"7e3869bafd618a75247cd2082e6e72343425ec7e"}

[commit-bot: I haz the power, 2017-05-23 02:52:09]

Description was changed from

==========
Revert of Track task ids for navigations cross multiple tabs. (patchset #4
id:80001 of https://codereview.chromium.org/2868043003/ )

Reason for revert:
crbug.com/725026 and crbug.com/724497

Original issue's description:
> Track task ids for navigations cross multiple tabs.
> 
> This is a following step to generate task ids for navigations. Now we
> can track navigation relationship cross multiple tabs. If navigation B
> in tab2 is clicked from navigation A in tab1, then navigation A is B's
> parent task. And this is generalized to more than 2 tabs.
> 
> BUG=707978
> R=zea@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2868043003
> Cr-Commit-Position: refs/heads/master@{#472667}
> Committed:
https://chromium.googlesource.com/chromium/src/+/854b8bcfc787413293c86eddd979...

TBR=shenchao@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=707978
==========

to

==========
Revert of Track task ids for navigations cross multiple tabs. (patchset #4
id:80001 of https://codereview.chromium.org/2868043003/ )

Reason for revert:
crbug.com/725026 and crbug.com/724497

Original issue's description:
> Track task ids for navigations cross multiple tabs.
> 
> This is a following step to generate task ids for navigations. Now we
> can track navigation relationship cross multiple tabs. If navigation B
> in tab2 is clicked from navigation A in tab1, then navigation A is B's
> parent task. And this is generalized to more than 2 tabs.
> 
> BUG=707978
> R=zea@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2868043003
> Cr-Commit-Position: refs/heads/master@{#472667}
> Committed:
https://chromium.googlesource.com/chromium/src/+/854b8bcfc787413293c86eddd979...

TBR=shenchao@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=707978

Review-Url: https://codereview.chromium.org/2901533003
Cr-Commit-Position: refs/heads/master@{#473790}
Committed:
https://chromium.googlesource.com/chromium/src/+/7e3869bafd618a75247cd2082e6e...
==========

[commit-bot: I haz the power, 2017-05-23 02:52:11]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/7e3869bafd618a75247cd2082e6e...