Add an upload presubmit rule to catch disallowed use of Chromium namespaces.

Add an upload presubmit rule to catch disallowed use of Chromium namespaces.

These namespaces and classes may soon be linked into Blink's core (via platform
and/or WTF), but they are not intended to be used within Blink's engine.

This rule should catch most inadvertent cases of this, and #include is already
checked by check-blink-deps.

TESTED=manually

Committed: https://crrev.com/bcc0d06fbc3bf08d416c7143056d26a4a418b00b
Cr-Commit-Position: refs/heads/master@{#360165}

[jbroman, 2015-11-17 17:56:15]

jbroman@chromium.org changed reviewers:
+ esprehn@chromium.org

[jbroman, 2015-11-17 17:56:16]

If this satisfies you as far as automated checks for Chromium use outside of the
right places, I'll send it to someone with owners of this file for further
review.

[esprehn, 2015-11-17 21:12:11]

lgtm

[jbroman, 2015-11-17 21:13:08]

jbroman@chromium.org changed reviewers:
+ dpranke@chromium.org

[jbroman, 2015-11-17 21:13:08]

+dpranke for PRESUBMIT.py OWNERS

[Dirk Pranke, 2015-11-17 21:23:53]

lgtm

[jbroman, 2015-11-17 21:27:07]

The CQ bit was checked by jbroman@chromium.org

[commit-bot: I haz the power, 2015-11-17 21:27:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1453743002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1453743002/1

[commit-bot: I haz the power, 2015-11-17 21:32:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-17 21:33:42]

Patchset 1 (id:??) landed as
https://crrev.com/bcc0d06fbc3bf08d416c7143056d26a4a418b00b
Cr-Commit-Position: refs/heads/master@{#360165}