clang: Suppress a -Wstring-conversion warnings in nspr.

clang: Suppress a -Wstring-conversion warnings in nspr.

Do the gn version directly, and roll the nss dep to pick up the gyp version.

BUG=82385
R=hans@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/109b55f5bed033a46f10fd2f50093b82f03586f3

[Nico, 2014-11-25 21:42:18]

thakis@chromium.org changed reviewers:
+ hans@chromium.org

[hans, 2014-11-25 21:45:51]

lgtm

[Nico, 2014-11-25 21:46:01]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2014-11-25 21:47:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/754623004/1

[commit-bot: I haz the power, 2014-11-25 22:02:43]

Patchset 1 (id:??) landed as
https://crrev.com/109b55f5bed033a46f10fd2f50093b82f03586f3
Cr-Commit-Position: refs/heads/master@{#305703}

[Nico, 2014-11-25 22:02:51]

Committed patchset #1 (id:1) manually as
109b55f5bed033a46f10fd2f50093b82f03586f3 (presubmit successful).

[vrk (LEFT CHROMIUM), 2014-11-26 00:46:34]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/758303002/ by vrk@chromium.org.

The reason for reverting is: Build failed:
http://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Linux%...
"ERROR: Shared library dependencies changed!"

Unsure if this is the cause, but it looks like a clang roll a few weeks ago
caused a similar error message (crbug.com/433065) so seeing if a revert fixes
things :) sorry if this is the wrong CL!.