Fix number of buckets in AsyncDNS.ServerCount and ServerFailureIndex UMA histograms.

Fix number of buckets in AsyncDNS.ServerCount and ServerFailureIndex UMA histograms.

Fix number of buckets in AsyncDNS.ServerCount and SyncDNS.ServerFailureIndex UMA
histograms. Currently the value 9 falls in the bucket with value 8 which is
confusing. Results can be checked on uma.googleplex.com.

BUG=

Committed: https://crrev.com/23be9745d2dcf3730f0ed18f5c835478690eab46
Cr-Commit-Position: refs/heads/master@{#296950}

[timvolodine, 2014-09-08 15:51:06]

timvolodine@chromium.org changed reviewers:
+ mef@chromium.org, ttuttle@chromium.org

[mef, 2014-09-08 16:07:51]

lgtm, although I'm a bit surprised that we see DNS configs with 8-9 servers.

[timvolodine, 2014-09-26 15:07:27]

The CQ bit was checked by timvolodine@chromium.org

[commit-bot: I haz the power, 2014-09-26 15:07:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/551873002/1

[commit-bot: I haz the power, 2014-09-26 15:44:07]

Committed patchset #1 (id:1) as 9cbe8c178866f3bc91d09a22b88732232eee6554

[commit-bot: I haz the power, 2014-09-26 15:44:49]

Patchset 1 (id:??) landed as
https://crrev.com/23be9745d2dcf3730f0ed18f5c835478690eab46
Cr-Commit-Position: refs/heads/master@{#296950}