WebCrypto: Don't check for negative values from EVP_DigestVerifyFinal.

WebCrypto: Don't check for negative values from EVP_DigestVerifyFinal.

BoringSSL can no longer return negative values for it.

Committed: https://crrev.com/58fd4f4c6ec98f7cc04fbfe039ed8bf6ad36a05d
Cr-Commit-Position: refs/heads/master@{#303574}

[eroman, 2014-11-08 02:20:27]

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

[davidben, 2014-11-10 20:26:14]

lgtm

[eroman, 2014-11-10 20:45:02]

The CQ bit was checked by eroman@chromium.org

[commit-bot: I haz the power, 2014-11-10 20:45:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/688983004/1

[commit-bot: I haz the power, 2014-11-10 21:22:17]

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

[commit-bot: I haz the power, 2014-11-10 21:22:18]

Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)

[eroman, 2014-11-11 02:19:57]

The CQ bit was checked by eroman@chromium.org

[commit-bot: I haz the power, 2014-11-11 02:21:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/688983004/1

[commit-bot: I haz the power, 2014-11-11 02:37:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-11 02:38:20]

Patchset 1 (id:??) landed as
https://crrev.com/58fd4f4c6ec98f7cc04fbfe039ed8bf6ad36a05d
Cr-Commit-Position: refs/heads/master@{#303574}