Add Omnibox Histogram Suffix
Add Omnibox Histogram Suffix

When I replaced Omnibox.ProviderTime (which uses suffixes to generate a
list of histograms) with Omnibox.ProviderTime2, I forgot to update the
suffix section of histograms.xml with the new histogram prefix.

BUG=

Review URL: https://codereview.chromium.org/1409143008

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#355909}

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