Revert 284459 "Add FailureValue and wire it through PageTestResu..."

Revert 284459 "Add FailureValue and wire it through PageTestResu..."

Reverting in hopes of getting android telemetry_perf_unittests to
green. Here's output:
http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/14733/steps/telemetry_perf_unittests/logs/stdio

Unhandled exception while running file://scrollable_page.html

Traceback (most recent call last):
  _RunPage at tools/telemetry/telemetry/page/page_runner.py:533
    test.RunPage(page, page_state.tab, results)
  RunPage at tools/telemetry/telemetry/page/page_test.py:228
    self.WillRunActions(page, tab)
  WillRunActions at tools/perf/measurements/smoothness.py:26
    self._power_metric.Start(page, tab)
  Start at tools/perf/metrics/power.py:77
    self._browser.platform.StartMonitoringPower(self._browser)
  StartMonitoringPower at
  tools/telemetry/telemetry/core/platform/__init__.py:193
    self._platform_backend.StartMonitoringPower(browser)
  StartMonitoringPower at
  tools/telemetry/telemetry/core/platform/android_platform_backend.py:251
    self._powermonitor.StartMonitoringPower(browser)
  StartMonitoringPower at
  tools/telemetry/telemetry/core/platform/power_monitor/android_temperature_monitor.py:31
    self._power_monitor.StartMonitoringPower(browser)
  StartMonitoringPower at
  tools/telemetry/telemetry/core/platform/power_monitor/power_monitor_controller.py:29
    self._active_monitor.StartMonitoringPower(browser)
  StartMonitoringPower at
  tools/telemetry/telemetry/core/platform/power_monitor/android_dumpsys_power_monitor.py:33
    'Must call StopMonitoringPower().')
AssertionError: Must call StopMonitoringPower().


> Add FailureValue and wire it through PageTestResults.
> 
> BUG=392901
> 
> Review URL: https://codereview.chromium.org/399263003

TBR=chrishenry@google.com

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284497

[sky, 2014-07-21 20:52:38]

Committed patchset #1 manually as r284497 (tree was closed).