Revert of [DevTools] Move SystemInfo domain to generated handler

Revert of [DevTools] Move SystemInfo domain to generated handler (patchset #5 id:120001 of https://codereview.chromium.org/665123002/)

Reason for revert:
This probably brok the WinXP perf bots:
http://build.chromium.org/p/chromium.perf/builders/Win%20XP%20Perf%20%284%29/builds/801

Speculatively reverting.

Original issue's description:
> [DevTools] Move SystemInfo domain to generated handler
>
> BUG=405566
>
> Committed: https://crrev.com/7c848788f642cd4c62cb11e890b4685f4a5f3b34
> Cr-Commit-Position: refs/heads/master@{#303827}

TBR=dgozman@chromium.org,jbauman@chromium.org,vkuzkokov@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=405566
Committed: https://crrev.com/20902dff04142ee703a45f988417ac96e7795e9e
Cr-Commit-Position: refs/heads/master@{#303857}

[ernstm, 2014-11-12 18:26:23]

Created Revert of [DevTools] Move SystemInfo domain to generated handler

[commit-bot: I haz the power, 2014-11-12 18:27:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/723623003/1

[commit-bot: I haz the power, 2014-11-12 18:28:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-12 18:30:20]

Patchset 1 (id:??) landed as
https://crrev.com/20902dff04142ee703a45f988417ac96e7795e9e
Cr-Commit-Position: refs/heads/master@{#303857}