Don't run video_quality_loopback_test from the src dir.

When executed on swarming, the script is run from //out/<android build dir>,
so it's better to keep that convention.

Given that all paths are given, cwd doesn't seem to be needed.

TBR=phoglund@webrtc.org

Bug: chromium:755660
Change-Id: Iabf6603983ff88b1281e8113da1aad3320967b72
Reviewed-on: https://webrtc-review.googlesource.com/46142
Reviewed-by: Edward Lemur <ehmaldonado@webrtc.org>
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21843}

examples/androidtests/video_quality_loopback_test.py

@@ -49,19 +49,19 @@ class VideoQualityTestError(Error):
   pass
 
 
-def _RunCommand(argv, cwd=SRC_DIR, **kwargs):
+def _RunCommand(argv, **kwargs):
   logging.info('Running %r', argv)
-  subprocess.check_call(argv, cwd=cwd, **kwargs)
+  subprocess.check_call(argv, **kwargs)
 
 
-def _RunCommandWithOutput(argv, cwd=SRC_DIR, **kwargs):
+def _RunCommandWithOutput(argv, **kwargs):
   logging.info('Running %r', argv)
-  return subprocess.check_output(argv, cwd=cwd, **kwargs)
+  return subprocess.check_output(argv, **kwargs)
 
 
-def _RunBackgroundCommand(argv, cwd=SRC_DIR):
+def _RunBackgroundCommand(argv):
   logging.info('Running %r', argv)
-  process = subprocess.Popen(argv, cwd=cwd)
+  process = subprocess.Popen(argv)
   time.sleep(0.5)
   status = process.poll()
   if status:  # is not None or 0