Revert of [tools] Support custom script injection for callstats.py

Revert of [tools] Support custom script injection for callstats.py (patchset #1 id:1 of https://codereview.chromium.org/2455623002/ )

Reason for revert:
speculative revert to address regressions on cnn.com benchmark.

Original issue's description:
> [tools] Support custom script injection for callstats.py
>
> This is a poor-man's solution to trigger page interactions.
>
> BUG=

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

Committed: https://crrev.com/fdf0b3ee7a9f56a6511d86b5a37f78f7c1b56390
Cr-Commit-Position: refs/heads/master@{#40710}

[Camillo Bruni, 2016-11-02 20:15:05]

The CQ bit was checked by cbruni@chromium.org

[Camillo Bruni, 2016-11-02 20:15:05]

Created Revert of [tools] Support custom script injection for callstats.py

[commit-bot: I haz the power, 2016-11-02 20:15:17]

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, 2016-11-02 20:36:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:19:50]

Description was changed from

==========
Revert of [tools] Support custom script injection for callstats.py (patchset #1
id:1 of https://codereview.chromium.org/2455623002/ )

Reason for revert:
speculative revert to address regressions on cnn.com benchmark.

Original issue's description:
> [tools] Support custom script injection for callstats.py
> 
> This is a poor-man's solution to trigger page interactions.
> 
> BUG=

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

to

==========
Revert of [tools] Support custom script injection for callstats.py (patchset #1
id:1 of https://codereview.chromium.org/2455623002/ )

Reason for revert:
speculative revert to address regressions on cnn.com benchmark.

Original issue's description:
> [tools] Support custom script injection for callstats.py
>
> This is a poor-man's solution to trigger page interactions.
>
> BUG=

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

Committed: https://crrev.com/fdf0b3ee7a9f56a6511d86b5a37f78f7c1b56390
Cr-Commit-Position: refs/heads/master@{#40710}
==========

[commit-bot: I haz the power, 2016-11-17 22:19:52]

Patchset 1 (id:??) landed as
https://crrev.com/fdf0b3ee7a9f56a6511d86b5a37f78f7c1b56390
Cr-Commit-Position: refs/heads/master@{#40710}