Revert of Update metrics verification for dev-proxy.

Revert of Update metrics verification for dev-proxy. (patchset #3 id:80001 of https://codereview.chromium.org/553543004/)

Reason for revert:
This appears to have made ChromeProxyMetricsTest.testChromeProxyMetricForHeaderValidation fail in Android Tests: https://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/15658/steps/chrome_proxy/logs/stdio

Traceback (most recent call last):
  run at /usr/lib/python2.7/unittest/case.py:327
    testMethod()
  testChromeProxyMetricForHeaderValidation at tools/chrome_proxy/integration_tests/chrome_proxy_metrics_unittest.py:143
    metric.AddResultsForHeaderValidation(None, results)
  AddResultsForHeaderValidation at tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py:146
    bypassed, _ = self.IsProxyBypassed(tab)
  IsProxyBypassed at tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py:167
    bad_proxies = [str(p['proxy']) for p in info['badProxies']]
KeyError: 'badProxies'

Locals:
  info : {'proxies': ['compress.googlezip.net:80', 'direct://'], 'enabled': True}
  tab  : None

Original issue's description:
> Update metrics verification for dev-proxy.
> Remove http://aws1.mdw.la/piatek/bypass-demo, which is not bypassed by the server now.
> 
> BUG=412497
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/0bae38f3f8525a2b49d6df9f7152e1cc130851b1

TBR=bengr@chromium.org,bolian@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=412497
Committed: https://crrev.com/5d19ad1b49adc1d0417f15a5751903555016dfa9
Cr-Commit-Position: refs/heads/master@{#294065}

[Michael Courage, 2014-09-10 00:57:10]

Created Revert of Update metrics verification for dev-proxy.

[bolian, 2014-09-10 00:59:03]

lgtm.

[commit-bot: I haz the power, 2014-09-10 01:09:22]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/courage@chromium.org/555373002/1

[commit-bot: I haz the power, 2014-09-10 01:27:08]

Committed patchset #1 (id:1) as 3cbfdd98fa5b7c60740ae157f6b91c75fd6f7883

[commit-bot: I haz the power, 2014-09-10 03:57:23]

Patchset 1 (id:??) landed as
https://crrev.com/5d19ad1b49adc1d0417f15a5751903555016dfa9
Cr-Commit-Position: refs/heads/master@{#294065}