Revert of Run android tests through runtest.py. (https://codereview.chromium.org/410033002/)

Reason for revert:
Broke a ton of tests:
http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/14823

Original issue's description:
> Run android tests through runtest.py.
> 
> BUG=329102
> R=qyearsley@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285667

TBR=qyearsley@chromium.org,jbudorick@chromium.org,klundberg@chromium.org,navabi@chromium.org,yfriedman@chromium.org,eseidel@chromium.org,zty@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=329102

Review URL: https://codereview.chromium.org/423593002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285716 0039d316-1c4b-4281-b951-d872f2087c98

build/android/buildbot/bb_device_steps.py

@@ -96,29 +96,6 @@ def _GetRevision(options):
   return revision
 
 
-def _RunTest(options, cmd, suite):
-  """Run test command with runtest.py.
-
-  Args:
-    options: options object.
-    cmd: the command to run.
-    suite: test name.
-  """
-  property_args = bb_utils.EncodeProperties(options)
-  args = [os.path.join(SLAVE_SCRIPTS_DIR, 'runtest.py'),
-      '--test-type',
-      suite,
-      '--run-python-script'
-    ] + property_args
-  if options.factory_properties.get('generate_gtest_json'):
-    args.append('--generate-json-file')
-
-  if options.target == 'Release':
-    args += ['--target', 'Release']
-  args += cmd
-  RunCmd(args)
-
-
 def RunTestSuites(options, suites, suites_options=None):
   """Manages an invocation of test_runner.py for gtests.
 
@@ -148,7 +125,7 @@ def RunTestSuites(options, suites, suites_options=None):
     cmd += suites_options.get(suite, [])
     if suite == 'content_browsertests':
       cmd.append('--num_retries=1')
-    _RunTest(options, cmd, suite)
+    RunCmd(cmd)
 
 
 def RunChromeDriverTests(options):