[presubmit] Enable readability/namespace linter checking.

[presubmit] Enable readability/namespace linter checking.

This enables linter checking for "readability/namespace" violations
during presubmit and instead marks the few known exceptions that we
allow explicitly.

R=bmeurer@chromium.org

Committed: https://crrev.com/6a769ac1df0e407d5623170a6cc150a99b9f4ea4
Cr-Commit-Position: refs/heads/master@{#31019}

[Michael Starzinger, 2015-09-29 12:28:12]

Mostly mass-replace, just a few manual edits, all mechanical.

https://codereview.chromium.org/1371083003/diff/1/src/objects.h
File src/objects.h (right):

https://codereview.chromium.org/1371083003/diff/1/src/objects.h#newcode10629
src/objects.h:10629: }  // NOLINT, false-positive due to second-order macros.
The linter is confused by our gigantic second-order macros, surprise.

[Benedikt Meurer, 2015-09-29 14:45:46]

Wow, massive change :-)
LGTM

[ulan, 2015-09-29 16:38:48]

ulan@chromium.org changed reviewers:
+ ulan@chromium.org

[ulan, 2015-09-29 16:38:50]

debug and regexp changes lgtm

[Toon Verwaest, 2015-09-30 12:27:24]

verwaest@chromium.org changed reviewers:
+ verwaest@chromium.org

[Toon Verwaest, 2015-09-30 12:27:25]

snapshot lgtm

[Michael Starzinger, 2015-09-30 13:36:36]

The CQ bit was checked by mstarzinger@chromium.org

[Michael Starzinger, 2015-09-30 13:36:37]

The patchset sent to the CQ was uploaded after l-g-t-m from
bmeurer@chromium.org, ulan@chromium.org, verwaest@chromium.org
Link to the patchset: https://codereview.chromium.org/1371083003/#ps20001
(title: "Rebased.")

[commit-bot: I haz the power, 2015-09-30 13:37:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1371083003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1371083003/20001

[commit-bot: I haz the power, 2015-09-30 13:47:07]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-30 13:47:22]

Patchset 2 (id:??) landed as
https://crrev.com/6a769ac1df0e407d5623170a6cc150a99b9f4ea4
Cr-Commit-Position: refs/heads/master@{#31019}