Revert of Accept invalid chrome-extension:// and chrome:// CSP tokens

Revert of Accept invalid chrome-extension:// and chrome:// CSP tokens (patchset #3 id:80001 of https://codereview.chromium.org/722233004/)

Reason for revert:
Need some extra comments before relanding

Original issue's description:
> Accept invalid chrome-extension:// and chrome:// CSP tokens
>
> Do not refuse to load the extension when the CSP contains
> "chrome-extension://", because there are some extensions in the wild
> that contains this token in the CSP. It is safe to accept this token
> because the invalid CSP token is ignored by Blink (together with an
> error message in the console, so the developer can fix the problem if
> they bother to look at the console).
>
> BUG=432227
> TBR=kalman@chromium.org
>
> Committed: https://crrev.com/67244e678279741947c09ba2ab18fbfec1707a97
> Cr-Commit-Position: refs/heads/master@{#304799}

TBR=kalman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=432227
Committed: https://crrev.com/cbc409a84a88dd002c37f113eabb74468448d00d
Cr-Commit-Position: refs/heads/master@{#304832}

[robwu, 2014-11-19 17:38:20]

Created Revert of Accept invalid chrome-extension:// and chrome:// CSP tokens

[commit-bot: I haz the power, 2014-11-19 17:38:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/739133003/1

[commit-bot: I haz the power, 2014-11-19 17:40:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-19 17:41:01]

Patchset 1 (id:??) landed as
https://crrev.com/cbc409a84a88dd002c37f113eabb74468448d00d
Cr-Commit-Position: refs/heads/master@{#304832}