Remove obsolete use of CLIPPED_HISTOGRMAS

Remove obsolete use of CLIPPED_HISTOGRMAS

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

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=95570

[jar (doing other things), 2011-08-02 22:46:21]

To drop in the subtle calls in histogram.h, I first decided I should clean up
use of a deprecated histogram macro.  To do this, I needed to update and/or
discard use of the old macro in favor of CUSTOM_HISTOGRAMS... which is what this
CL does.

[jar (doing other things), 2011-08-04 19:15:30]

Raman,

This is a pretty straight forward CL, and Will is probably on vacation.  Could
you have a look?

Thanks,

Jim

[ramant (doing other things), 2011-08-04 20:28:40]

LGTM.

thanks,
raman

[commit-bot: I haz the power, 2011-08-05 00:31:12]

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[jar (doing other things), 2011-08-05 01:12:04]

wtc,

I need a review from a net/* owner.  The change is all focused on histograms,
and is pretty minimal.

thanks,

Jim

[wtc, 2011-08-05 01:28:34]

LGTM.

[commit-bot: I haz the power, 2011-08-05 04:04:36]

Change committed as 95570