Revert of Fix and reenable checkbox in Polymer page set.

Revert of Fix and reenable checkbox in Polymer page set. (https://codereview.chromium.org/437353002/)

Reason for revert:
Fails on N5 (at least).

Unhandled exception while running http://www.polymer-project.org/components/paper-elements/demo.html#paper-checkbox

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:232
    self._RunMethod(page, self._action_name_to_run, action_runner)
  _RunMethod at tools/telemetry/telemetry/page/page_test.py:241
    run_method(action_runner)
  RunSmoothness at tools/perf/page_sets/polymer.py:124
    self.TouchEverything(action_runner)
  TouchEverything at tools/perf/page_sets/polymer.py:154
    self.DoActionOnWidgetType(action_runner, tappable_type, self.TapWidget)
  DoActionOnWidgetType at tools/perf/page_sets/polymer.py:169
    element_query + '.offsetParent != null'):
  EvaluateJavaScript at tools/telemetry/telemetry/page/actions/action_runner.py:148
    return self._tab.EvaluateJavaScript(expression)
  EvaluateJavaScript at tools/telemetry/telemetry/core/web_contents.py:108
    expr, context_id=None, timeout=timeout)
  EvaluateJavaScriptInContext at tools/telemetry/telemetry/core/web_contents.py:124
    expr, context_id=context_id, timeout=timeout)
  EvaluateJavaScript at tools/telemetry/telemetry/core/backends/chrome/inspector_backend.py:176
    return self._runtime.Evaluate(expr, context_id, timeout)
  Evaluate at tools/telemetry/telemetry/core/backends/chrome/inspector_runtime.py:46
    raise exceptions.EvaluateException(res['result']['result']['description'])
EvaluateException: TypeError: Cannot read property 'offsetParent' of undefined

Locals:
  context_id : None
  expr       : 'document.querySelector("sampler-scaffold").$.frame.contentDocument.querySelectorAll("body paper-checkbox:not([disabled]):not([active]):not([checked])")[2].offsetParent != null'
  request    : {'params': {'returnByValue': True, 'expression': 'document.querySelector("sampler-scaffold").$.frame.contentDocument.querySelectorAll("body paper-checkbox:not([disabled]):not([active]):not([checked])")[2].offsetParent != null'}, 'method': 'Runtime.evaluate', 'id': 173}
  res        : {u'id': 173, u'result': {u'wasThrown': True, u'exceptionDetails': {u'url': u'', u'text': u"Uncaught TypeError: Cannot read property 'offsetParent' of undefined", u'line': 1, u'column': 68}, u'result': {u'className': u'TypeError', u'type': u'object', u'description': u"TypeError: Cannot read property 'offsetParent' of undefined", u'objectId': u'{"injectedScriptId":4,"id":1}'}}}
  timeout    : 90

http://chromegw/i/chromium.perf/builders/Android%20Nexus5%20Perf/builds/1213/steps/smoothness.polymer/logs/stdio

Original issue's description:
> Fix and reenable checkbox in Polymer page set.
> 
> BUG=394756
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287596

TBR=dtu@chromium.org,nduca@chromium.org,wiltzius@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=394756
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287667

[tonyg, 2014-08-06 02:55:47]

Created Revert of Fix and reenable checkbox in Polymer page set.

[commit-bot: I haz the power, 2014-08-06 02:57:13]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tonyg@chromium.org/443793002/1

[commit-bot: I haz the power, 2014-08-06 02:59:58]

Change committed as 287667