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Histograms that "clip" data (discard samples
over a given point) make it hard or impossible
to contrast results (such as via trimmed means).
As a result, a long standing note asked that these
histogram form no longer be used.
This CL removes all remaining uses, and discards
so histograms that are no longer significant (to
SDCH experimentation).  We transition to 
CUSTOM_HISTOGRAMS for all cases where the data
appears to be useful (and we provide new names
for the histograms).

r=rtenneti,wtc

Review URL: http://codereview.chromium.org/7553025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95570 0039d316-1c4b-4281-b951-d872f2087c98