Remove unused error codes and fix mapping of weak DH key.

Fix mapping of weak DH key and remove unused error codes.

None of these error codes are actually reported back by BoringSSL.

SSL_R_WRONG_NUMBER_OF_KEY_BITS is changed to the proper
error code SSL_R_BAD_DH_P_LENGTH.

Test DH issue by loading https://demo.cmrg.net/

BUG=353579
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=291051

[haavardm, 2014-08-20 15:12:28]

agl, please review.

[agl, 2014-08-20 20:08:54]

lgtm

[agl, 2014-08-20 20:08:56]

The CQ bit was checked by agl@chromium.org

[commit-bot: I haz the power, 2014-08-20 20:10:35]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/haavardm@opera.com/495553002/1

[commit-bot: I haz the power, 2014-08-20 21:58:25]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu/builds/...)
  mac_gpu_retina_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu_retina_tr...)
  mac_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu_triggered...)
  android_clang_dbg on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)
  android_dbg_tests_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_dbg_tes...)

[commit-bot: I haz the power, 2014-08-20 22:01:17]

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

[commit-bot: I haz the power, 2014-08-20 22:01:18]

Try jobs failed on following builders:
  linux_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu/builds/...)
  android_clang_dbg on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)

[haavardm, 2014-08-21 06:32:31]

The CQ bit was checked by haavardm@opera.com

[commit-bot: I haz the power, 2014-08-21 06:33:59]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/haavardm@opera.com/495553002/1

[commit-bot: I haz the power, 2014-08-21 12:07:26]

Committed patchset #1 (1) as 291051