Revert of Update speedometer to use results.AddValue

Revert of Update speedometer to use results.AddValue (https://codereview.chromium.org/386893004/)

Reason for revert:
Breaks speedometer. Should be a ListOfScalarValues.

Traceback (most recent call last):
  _RunPage at tools/telemetry/telemetry/page/page_runner.py:534
    test.RunPage(page, page_state.tab, results)
  RunPage at tools/telemetry/telemetry/page/page_test.py:247
    self.ValidatePage(page, tab, results)
  ValidatePage at tools/telemetry/telemetry/page/page_measurement.py:62
    self.MeasurePage(page, tab, results)
  MeasurePage at tools/perf/benchmarks/speedometer.py:36
    tab.EvaluateJavaScript('benchmarkClient._timeValues')))
  __init__ at tools/telemetry/telemetry/value/scalar.py:19
    assert isinstance(value, numbers.Number)
AssertionError

Locals:
  important : True
  name      : 'Total'
  page      : <telemetry.page.page.Page object at 0x1d6e590>
  units     : 'ms'
  value     : [13237.9869999991, 13351.2720000012, 14052.7640000023, 14136.3950000013, 13685.9580000001, 14048.2879999999, 14010.3279999989, 13941.6210000018, 14087.0519999998, 13388.6279999983]

Original issue's description:
> Update speedometer to use results.AddValue
> 
> BUG=391943
> TBR=nduca@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282750

TBR=nduca@chromium.org,nednguyen@google.com
NOTREECHECKS=true
NOTRY=true
BUG=391943
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282784

[tonyg, 2014-07-12 02:26:58]

Created Revert of Update speedometer to use results.AddValue

[commit-bot: I haz the power, 2014-07-12 02:28:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tonyg@chromium.org/387953006/1

[commit-bot: I haz the power, 2014-07-12 02:32:02]

Change committed as 282784