Remove ERR_SSL_UNSAFE_NEGOTIATION error code.

Remove ERR_SSL_UNSAFE_NEGOTIATION error code.

Let them map to the default ERR_SSL_PROTOCOL_ERROR. It was added, along with a
custom error message, in https://crrev.com/51258. The
enforcement was then removed in https://codereview.chromium.org/6792032, but
the error code and custom message remained. Prune them; the error is now
unreachable but for some codepaths in NSS (server originally supported RI and
renego without it) and the custom error message is now innaccurate.

BUG=none

Committed: https://crrev.com/9a38456c11f5f6031e6710e958f7838e978ee05d
Cr-Commit-Position: refs/heads/master@{#332125}

[davidben, 2015-05-29 20:42:39]

davidben@chromium.org changed reviewers:
+ agl@chromium.org

[agl, 2015-05-29 21:12:36]

lgtm

[davidben, 2015-05-29 21:18:37]

davidben@chromium.org changed reviewers:
+ jhawkins@chromium.org, sgurun@chromium.org

[davidben, 2015-05-29 21:18:38]

+sgurun for android_webview
+jhawkins for chrome/common/localized_error.cc

[sgurun-gerrit only, 2015-05-29 21:24:33]

On 2015/05/29 21:18:38, David Benjamin wrote:
> +sgurun for android_webview
> +jhawkins for chrome/common/localized_error.cc

aw lgtm

[James Hawkins, 2015-05-30 05:13:28]

lgtm

[davidben, 2015-05-30 18:31:23]

The CQ bit was checked by davidben@chromium.org

[commit-bot: I haz the power, 2015-05-30 18:31:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1151833004/1

[commit-bot: I haz the power, 2015-05-30 18:34:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-30 18:35:28]

Patchset 1 (id:??) landed as
https://crrev.com/9a38456c11f5f6031e6710e958f7838e978ee05d
Cr-Commit-Position: refs/heads/master@{#332125}