Remove Net.URLRequest_SetReferrer_IsEmptyOrValid histogram.
commitd851d064ee06e6835b7ef153ec4afe5c3aeb77ee
authorasvitkine@chromium.org <asvitkine@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Wed, 25 Jun 2014 06:43:01 +0000 (25 06:43 +0000)
committerasvitkine@chromium.org <asvitkine@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Wed, 25 Jun 2014 06:43:01 +0000 (25 06:43 +0000)
tree6451decd1cf8cd2d63c68c03ec56155178496698
parentb208f96775c3fa1a3b4696a1d80b8db216fc7a4e
Remove Net.URLRequest_SetReferrer_IsEmptyOrValid histogram.

According to internal stats, this was the top 5 histogram
that's taking up space in UMA and it was never documented
in histograms.xml, which means no one has ever looked at
its data. Delete it so that it stop taking resources without
providing value.

Document it in histograms.xml so that previous data can
still be viewed on the dashboard, if needed.

BUG=387734

Review URL: https://codereview.chromium.org/331343003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@279639 0039d316-1c4b-4281-b951-d872f2087c98
net/url_request/url_request.cc
tools/metrics/histograms/histograms.xml