Fix the number of buckets in Net.Wifi.InterfaceCount UMA histogram.

Fix the number of buckets in Net.Wifi.InterfaceCount UMA histogram.

The number of buckets should be one more than currently specified.
Otherwise the histogram buckets the values 3 and 4 in the same bucket.

BUG=

Committed: https://crrev.com/195037f04dc4627ca7aaf523ad035522e01ab7ae
Cr-Commit-Position: refs/heads/master@{#294808}

[timvolodine, 2014-09-08 15:25:21]

timvolodine@chromium.org changed reviewers:
+ mvanouwerkerk@chromium.org

[Michael van Ouwerkerk, 2014-09-09 15:04:06]

lgtm

Looks like this is not even instrumented on linux :-(

[timvolodine, 2014-09-15 11:59:50]

The CQ bit was checked by timvolodine@chromium.org

[commit-bot: I haz the power, 2014-09-15 12:00:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/547693002/1

[commit-bot: I haz the power, 2014-09-15 12:57:35]

Committed patchset #1 (id:1) as e8038643c0a1e013669f59428fdfa8db31fa865b

[commit-bot: I haz the power, 2014-09-15 13:02:07]

Patchset 1 (id:??) landed as
https://crrev.com/195037f04dc4627ca7aaf523ad035522e01ab7ae
Cr-Commit-Position: refs/heads/master@{#294808}