Remove unused histogram that races in single process mode
Remove unused histogram that races in single process mode

Single process can race to run the static initializer, and
this change gets rid of the histograms which are now unused
(and only used for a fallback in single process mode).

r=eroman
Review URL: http://codereview.chromium.org/5630001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@68220 0039d316-1c4b-4281-b951-d872f2087c98

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