Revert of [DevTools] Postpone more agents instantiation until attached.

Revert of [DevTools] Postpone more agents instantiation until attached. (patchset #1 id:1 of https://codereview.chromium.org/1746393003/ )

Reason for revert:
Speculative revert to fix performance regressions: https://bugs.chromium.org/p/chromium/issues/detail?id=591406

Original issue's description:
> [DevTools] Postpone more agents instantiation until attached.
>
> To support multiple attached devtools, we have to instantiate
> individual agents on demand, rather than on creation.
> This patch moves most of agents, with only worker and inspector to go.
>
> BUG=590878
>
> Committed: https://crrev.com/b547858514737d59af3c55b2b06b4e511624c304
> Cr-Commit-Position: refs/heads/master@{#378509}

TBR=pfeldman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=590878
Committed: https://crrev.com/924fe8af695e29594c55db971d793d4d931b337c
Cr-Commit-Position: refs/heads/master@{#379111}

[dgozman, 2016-03-03 19:25:55]

Created Revert of [DevTools] Postpone more agents instantiation until attached.

[commit-bot: I haz the power, 2016-03-03 19:26:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1761663003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1761663003/1

[commit-bot: I haz the power, 2016-03-03 19:28:59]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-03-03 19:29:00]

Try jobs failed on following builders:
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_gn_rel on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_gn_r...)

[dgozman, 2016-03-03 21:03:03]

The CQ bit was checked by dgozman@chromium.org

[commit-bot: I haz the power, 2016-03-03 21:03:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1761663003/260001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1761663003/260001

[commit-bot: I haz the power, 2016-03-03 22:18:25]

Committed patchset #2 (id:260001)

[commit-bot: I haz the power, 2016-03-03 22:19:37]

Description was changed from

==========
Revert of [DevTools] Postpone more agents instantiation until attached.
(patchset #1 id:1 of https://codereview.chromium.org/1746393003/ )

Reason for revert:
Speculative revert to fix performance regressions:
https://bugs.chromium.org/p/chromium/issues/detail?id=591406

Original issue's description:
> [DevTools] Postpone more agents instantiation until attached.
> 
> To support multiple attached devtools, we have to instantiate
> individual agents on demand, rather than on creation.
> This patch moves most of agents, with only worker and inspector to go.
> 
> BUG=590878
> 
> Committed: https://crrev.com/b547858514737d59af3c55b2b06b4e511624c304
> Cr-Commit-Position: refs/heads/master@{#378509}

TBR=pfeldman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=590878
==========

to

==========
Revert of [DevTools] Postpone more agents instantiation until attached.
(patchset #1 id:1 of https://codereview.chromium.org/1746393003/ )

Reason for revert:
Speculative revert to fix performance regressions:
https://bugs.chromium.org/p/chromium/issues/detail?id=591406

Original issue's description:
> [DevTools] Postpone more agents instantiation until attached.
>
> To support multiple attached devtools, we have to instantiate
> individual agents on demand, rather than on creation.
> This patch moves most of agents, with only worker and inspector to go.
>
> BUG=590878
>
> Committed: https://crrev.com/b547858514737d59af3c55b2b06b4e511624c304
> Cr-Commit-Position: refs/heads/master@{#378509}

TBR=pfeldman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=590878

Committed: https://crrev.com/924fe8af695e29594c55db971d793d4d931b337c
Cr-Commit-Position: refs/heads/master@{#379111}
==========

[commit-bot: I haz the power, 2016-03-03 22:19:38]

Patchset 2 (id:??) landed as
https://crrev.com/924fe8af695e29594c55db971d793d4d931b337c
Cr-Commit-Position: refs/heads/master@{#379111}