Revert of purge nss files and dependencies

Revert of purge nss files and dependencies (patchset #1 id:1 of https://codereview.webrtc.org/1313233005/ )

Reason for revert:
It looks like this broke the FYI bots. I tried updating libjingle_nacl.gyp, but the IOS build still failed because in Chrome it's configured to use NSS. See https://codereview.chromium.org/1316863012/.

Original issue's description:
> purge nss files and dependencies
>
> BUG=webrtc:4497
>
> Committed: https://crrev.com/5647a2cf3db888195c928a1259d98f72f6ecbc15
> Cr-Commit-Position: refs/heads/master@{#9862}

TBR=tommi@webrtc.org,kjellander@webrtc.org,torbjorng@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4497
Committed: https://crrev.com/9eb1365939683cc5462a5359344148efb7d84f97
Cr-Commit-Position: refs/heads/master@{#9867}

[Taylor Brandstetter, 2015-09-04 23:01:37]

Created Revert of purge nss files and dependencies

[commit-bot: I haz the power, 2015-09-04 23:01:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1311843006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1311843006/1

[commit-bot: I haz the power, 2015-09-04 23:01:47]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-04 23:01:48]

No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Taylor Brandstetter, 2015-09-04 23:06:15]

The CQ bit was checked by deadbeef@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-04 23:06:27]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1311843006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1311843006/1

[commit-bot: I haz the power, 2015-09-04 23:06:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-04 23:06:29]

Dry run: No L-G-T-M from a valid reviewer yet. Only full committers are
accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[tommi, 2015-09-05 11:36:38]

The CQ bit was checked by tommi@webrtc.org

[commit-bot: I haz the power, 2015-09-05 11:36:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1311843006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1311843006/1

[commit-bot: I haz the power, 2015-09-05 11:36:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-05 11:36:49]

No L-G-T-M from a valid reviewer yet. Only full committers are accepted.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[tommi, 2015-09-05 11:39:00]

The CQ bit was checked by tommi@webrtc.org

[tommi, 2015-09-05 11:39:00]

lgtm

[commit-bot: I haz the power, 2015-09-05 11:39:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1311843006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1311843006/1

[commit-bot: I haz the power, 2015-09-05 11:39:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-05 11:39:32]

Patchset 1 (id:??) landed as
https://crrev.com/9eb1365939683cc5462a5359344148efb7d84f97
Cr-Commit-Position: refs/heads/master@{#9867}