Revert of [Telemetry] Fix a flake in android browser finder.

Revert of [Telemetry] Fix a flake in android browser finder. (https://codereview.chromium.org/394423002/)

Reason for revert:
BUG=395228
Original issue's description:
> [Telemetry] Fix a flake in android browser finder.
> 
> Traceback (most recent call last):
>   File "tools/perf/../telemetry/telemetry/decorators.py", line 50, in wrapper
>     func(*args, **kwargs)
>   File "/b/build/slave/Android_Tests/build/src/tools/perf/benchmarks/benchmark_unittest.py", line 51, in BenchmarkSmokeTest
>     self.assertEqual(0, SinglePageBenchmark().Run(options),
>   File "tools/perf/../telemetry/telemetry/benchmark.py", line 84, in Run
>     results = page_runner.Run(test, ps, expectations, args)
>   File "tools/perf/../telemetry/telemetry/page/page_runner.py", line 346, in Run
>     possible_browser = browser_finder.FindBrowser(finder_options)
>   File "tools/perf/../telemetry/telemetry/decorators.py", line 26, in Cacher
>     cache[key] = obj(*args, **kwargs)
>   File "tools/perf/../telemetry/telemetry/core/browser_finder.py", line 73, in FindBrowser
>     curr_browsers = finder.FindAllAvailableBrowsers(options)
>   File "tools/perf/../telemetry/telemetry/core/backends/chrome/android_browser_finder.py", line 214, in FindAllAvailableBrowsers
>     pids  = [p.pid for p in psutil.process_iter() if 'adb' in p.name]
>   File "/usr/lib/python2.7/dist-packages/psutil/__init__.py", line 161, in name
>     cmdline = self.cmdline
>   File "/usr/lib/python2.7/dist-packages/psutil/__init__.py", line 188, in cmdline
>     return self._platform_impl.get_process_cmdline()
>   File "/usr/lib/python2.7/dist-packages/psutil/_pslinux.py", line 327, in wrapper
>     raise NoSuchProcess(self.pid, self._process_name)
> NoSuchProcess: process no longer exists (pid=13764)
> 
> Observed here:
> http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/14626/steps/telemetry_perf_unittests/logs/stdio
> 
> BUG=
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284144

TBR=dtu@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284187

[tonyg, 2014-07-18 20:05:34]

Created Revert of [Telemetry] Fix a flake in android browser finder.

[commit-bot: I haz the power, 2014-07-18 20:07:38]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tonyg@chromium.org/407633002/1

[commit-bot: I haz the power, 2014-07-18 20:09:37]

Change committed as 284187