Remove valgrind suppression entry for WebBlobRegistry::addDataToStream()

Remove valgrind suppression entry for WebBlobRegistry::addDataToStream()

It looks fixed. The bot is no longer running the test, so ran valgrind
locally.

R=yhirano
NOTRY=true
BUG=417093
Committed: https://crrev.com/853e5a966996ede02afcd4c0f778c1e6eefb8c7a
Cr-Commit-Position: refs/heads/master@{#301314}

[tyoshino (SeeGerritForStatus), 2014-10-23 05:53:19]

tyoshino@chromium.org changed reviewers:
+ yhirano@chromium.org

[yhirano, 2014-10-23 09:06:25]

lgtm

[tyoshino (SeeGerritForStatus), 2014-10-27 04:18:07]

The CQ bit was checked by tyoshino@chromium.org

[commit-bot: I haz the power, 2014-10-27 04:18:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/672143002/20001

[tyoshino (SeeGerritForStatus), 2014-10-27 04:18:36]

The CQ bit was unchecked by tyoshino@chromium.org

[commit-bot: I haz the power, 2014-10-27 04:18:38]

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

[commit-bot: I haz the power, 2014-10-27 04:18:44]

Committed patchset #2 (id:20001)

[tyoshino (SeeGerritForStatus), 2014-10-27 04:18:46]

The CQ bit was checked by tyoshino@chromium.org

[commit-bot: I haz the power, 2014-10-27 04:18:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/672143002/20001

[commit-bot: I haz the power, 2014-10-27 04:19:13]

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

[commit-bot: I haz the power, 2014-10-27 04:19:14]

Failed to apply the patch.

[commit-bot: I haz the power, 2014-10-27 04:19:22]

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

[commit-bot: I haz the power, 2014-10-27 04:19:31]

Patchset 2 (id:??) landed as
https://crrev.com/853e5a966996ede02afcd4c0f778c1e6eefb8c7a
Cr-Commit-Position: refs/heads/master@{#301314}