Revert of Revert 221427 "Add instrumentation to the MessagePumpMac family ..."

Revert of Revert 221427 "Add instrumentation to the MessagePumpMac family ..." (https://codereview.chromium.org/360373004/)

Reason for revert:
This revert seems to cause build failure:

http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Builder/builds/8982
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Full/builds/6497
http://build.chromium.org/p/chromium.linux/builders/Linux%20Builder/builds/34221


Original issue's description:
> Revert 221427 "Add instrumentation to the MessagePumpMac family ..."
> 
> This code is no longer needed, since the experiment is not viable.
> 
> > Add instrumentation to the MessagePumpMac family of classes.
> >
> > This adds UMA-uploaded histograms of sampling intervals for key points of data:
> > * Total time spent in a CFRunLoop
> > * Total time waiting in CFRunLoop
> > * Total time servicing MessagePump::Delegate (the MessageLoop)
> > * The MessageLoop queue size and queueing delay before servicing
> >
> > It adds 1 second sampling for 15 seconds at startup, only for the main thread
> > (NSApplication-based) run loops.
> >
> > The data will be used to determine if adding scheduling-like behavior to the
> > MessagePump will result in more efficient processing of the MessageLoop work.
> >
> > An unforunate side effect of this change is exposing another method on the
> > MessagePump::Delegate interface, but there does not appear to be a better way
> > to do this.
> >
> > BUG=264886
> > R=jar@chromium.org, mark@chromium.org
> >
> > Review URL: https://codereview.chromium.org/22911026
> 
> TBR=rsesek@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=280939

TBR=rsesek@chromium.org,rsesek@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=280948

[tzik, 2014-07-02 03:29:41]

Created Revert of Revert 221427 "Add instrumentation to the MessagePumpMac
family ..."

[commit-bot: I haz the power, 2014-07-02 03:30:42]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tzik@chromium.org/366873002/1

[commit-bot: I haz the power, 2014-07-02 03:32:01]

Change committed as 280948

[Robert Sesek, 2014-07-02 16:37:46]

A revert of this CL has been created in
https://codereview.chromium.org/368893002/ by rsesek@chromium.org.

The reason for reverting is: Trying again. Will clobber builder since I can't
repro this..