Revert of DevTools: fix aggregated donut chart cache population

Revert of DevTools: fix aggregated donut chart cache population (patchset #1 id:1 of https://codereview.chromium.org/2840463003/ )

Reason for revert:
Suspected cause of failure of virtual/threaded/inspector/tracing/timeline-js/timeline-runtime-stats.html in https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20(dbg)/builds/9644

Original issue's description:
> DevTools: fix aggregated donut chart cache population
> 
> The check for stats cache availablity was made on the first task in the main thread
> tasks list. If the first task happens to be filtered out, it never gets cache built for
> it. Later the cache presence check would look for a cache on the first task, never find
> it and forces recaching.
> 
> BUG=714934
> 
> Review-Url: https://codereview.chromium.org/2840463003
> Cr-Commit-Position: refs/heads/master@{#467114}
> Committed: https://chromium.googlesource.com/chromium/src/+/755b1656f38d135013f24ddd8b6ec046874beed2

TBR=pfeldman@chromium.org,alph@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=714934
Review-Url: https://codereview.chromium.org/2839083002
Cr-Commit-Position: refs/heads/master@{#467223}
Committed: https://chromium.googlesource.com/chromium/src/+/65df576fce3007b62084239cc8e37a45aea0368f

[sashab, 2017-04-26 03:50:23]

The CQ bit was checked by sashab@chromium.org

[sashab, 2017-04-26 03:50:23]

Created Revert of DevTools: fix aggregated donut chart cache population

[commit-bot: I haz the power, 2017-04-26 03:50:41]

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, 2017-04-26 03:51:03]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493178623246770, "parent_rev":
"3b9d4808c5fd97ac53ba145ccdc2623cd0e551ea", "commit_rev":
"65df576fce3007b62084239cc8e37a45aea0368f"}

[commit-bot: I haz the power, 2017-04-26 03:51:16]

Description was changed from

==========
Revert of DevTools: fix aggregated donut chart cache population (patchset #1
id:1 of https://codereview.chromium.org/2840463003/ )

Reason for revert:
Suspected cause of failure of
virtual/threaded/inspector/tracing/timeline-js/timeline-runtime-stats.html in
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20(dbg)/b...

Original issue's description:
> DevTools: fix aggregated donut chart cache population
> 
> The check for stats cache availablity was made on the first task in the main
thread
> tasks list. If the first task happens to be filtered out, it never gets cache
built for
> it. Later the cache presence check would look for a cache on the first task,
never find
> it and forces recaching.
> 
> BUG=714934
> 
> Review-Url: https://codereview.chromium.org/2840463003
> Cr-Commit-Position: refs/heads/master@{#467114}
> Committed:
https://chromium.googlesource.com/chromium/src/+/755b1656f38d135013f24ddd8b6e...

TBR=pfeldman@chromium.org,alph@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=714934
==========

to

==========
Revert of DevTools: fix aggregated donut chart cache population (patchset #1
id:1 of https://codereview.chromium.org/2840463003/ )

Reason for revert:
Suspected cause of failure of
virtual/threaded/inspector/tracing/timeline-js/timeline-runtime-stats.html in
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20(dbg)/b...

Original issue's description:
> DevTools: fix aggregated donut chart cache population
> 
> The check for stats cache availablity was made on the first task in the main
thread
> tasks list. If the first task happens to be filtered out, it never gets cache
built for
> it. Later the cache presence check would look for a cache on the first task,
never find
> it and forces recaching.
> 
> BUG=714934
> 
> Review-Url: https://codereview.chromium.org/2840463003
> Cr-Commit-Position: refs/heads/master@{#467114}
> Committed:
https://chromium.googlesource.com/chromium/src/+/755b1656f38d135013f24ddd8b6e...

TBR=pfeldman@chromium.org,alph@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=714934

Review-Url: https://codereview.chromium.org/2839083002
Cr-Commit-Position: refs/heads/master@{#467223}
Committed:
https://chromium.googlesource.com/chromium/src/+/65df576fce3007b62084239cc8e3...
==========

[commit-bot: I haz the power, 2017-04-26 03:51:17]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/65df576fce3007b62084239cc8e3...

[alph, 2017-04-28 18:59:28]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2851823002/ by alph@chromium.org.

The reason for reverting is: The patch has noting to do with the failing test.
In fact if you look at the flakiness dashboard the test is very flaky there:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType....