Revert of Include class relationship diagrams in network stack documentation.

Revert of Include class relationship diagrams in network stack documentation. (patchset #6 id:100001 of https://codereview.chromium.org/1859793002/ )

Reason for revert:
Something is still using the net_docs target, which was removed; builds are failing on the bots (but didn't fail on any try jobs above--see green).

Original issue's description:
> Include class relationship diagrams in network stack documentation.
>
> This CL includes class relationship diagrams for most of the
> classes mentioned in life_of_a_url_request.md and a sketch of the
> object relationships inside socket pools.  It also removes the net_docs
> target (which wasn't really being used) and adds information for debugging
> markdown changes and updating SVG files from dot source.
>
> BUG=None
> R=eroman@chromium.org
> R=mmenke@chromium.org
>
> Committed: https://crrev.com/fb2fd16bec430431971d14658ef3800b23f0ab3f
> Cr-Commit-Position: refs/heads/master@{#385934}

TBR=eroman@chromium.org,mmenke@chromium.org,scottmg@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Committed: https://crrev.com/88c6adb3c6e51ab5d5b9ab8d75d3c373c5f58518
Cr-Commit-Position: refs/heads/master@{#385941}

[Randy Smith (Not in Mondays), 2016-04-08 01:35:08]

Created Revert of Include class relationship diagrams in network stack
documentation.

[commit-bot: I haz the power, 2016-04-08 01:35:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1875583002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1875583002/1

[commit-bot: I haz the power, 2016-04-08 01:36:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-08 02:11:56]

Description was changed from

==========
Revert of Include class relationship diagrams in network stack documentation.
(patchset #6 id:100001 of https://codereview.chromium.org/1859793002/ )

Reason for revert:
Something is still using the net_docs target, which was removed; builds are
failing on the bots (but didn't fail on any try jobs above--see green).

Original issue's description:
> Include class relationship diagrams in network stack documentation.
> 
> This CL includes class relationship diagrams for most of the
> classes mentioned in life_of_a_url_request.md and a sketch of the
> object relationships inside socket pools.  It also removes the net_docs
> target (which wasn't really being used) and adds information for debugging
> markdown changes and updating SVG files from dot source.
> 
> BUG=None
> R=eroman@chromium.org
> R=mmenke@chromium.org
> 
> Committed: https://crrev.com/fb2fd16bec430431971d14658ef3800b23f0ab3f
> Cr-Commit-Position: refs/heads/master@{#385934}

TBR=eroman@chromium.org,mmenke@chromium.org,scottmg@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None
==========

to

==========
Revert of Include class relationship diagrams in network stack documentation.
(patchset #6 id:100001 of https://codereview.chromium.org/1859793002/ )

Reason for revert:
Something is still using the net_docs target, which was removed; builds are
failing on the bots (but didn't fail on any try jobs above--see green).

Original issue's description:
> Include class relationship diagrams in network stack documentation.
>
> This CL includes class relationship diagrams for most of the
> classes mentioned in life_of_a_url_request.md and a sketch of the
> object relationships inside socket pools.  It also removes the net_docs
> target (which wasn't really being used) and adds information for debugging
> markdown changes and updating SVG files from dot source.
>
> BUG=None
> R=eroman@chromium.org
> R=mmenke@chromium.org
>
> Committed: https://crrev.com/fb2fd16bec430431971d14658ef3800b23f0ab3f
> Cr-Commit-Position: refs/heads/master@{#385934}

TBR=eroman@chromium.org,mmenke@chromium.org,scottmg@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Committed: https://crrev.com/88c6adb3c6e51ab5d5b9ab8d75d3c373c5f58518
Cr-Commit-Position: refs/heads/master@{#385941}
==========

[commit-bot: I haz the power, 2016-04-08 02:11:57]

Patchset 1 (id:??) landed as
https://crrev.com/88c6adb3c6e51ab5d5b9ab8d75d3c373c5f58518
Cr-Commit-Position: refs/heads/master@{#385941}