Better delete of file in loopback script

webrtc/examples/androidapp/start_loopback_stubbed_camera_saved_video_out.py

 # Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 from optparse import OptionParser
 import random
@@ skipping 56 matching lines @@
 
   videooutsave = options.videooutsave
 
   call_length = options.call_length or 10
 
   room = ''.join(random.choice(string.ascii_letters + string.digits)
       for _ in range(8))
 
   # Delete output video file.
   if videoout:
-    subprocess.check_call(['adb', '-s', devname, 'shell', 'rm',
+    subprocess.check_call(['adb', '-s', devname, 'shell', 'rm', '-f',
         videoout])
 
   device = MonkeyRunner.waitForConnection(2, devname)
 
   extras = {
       'org.appspot.apprtc.USE_VALUES_FROM_INTENT': True,
       'org.appspot.apprtc.AUDIOCODEC': 'OPUS',
       'org.appspot.apprtc.LOOPBACK': True,
       'org.appspot.apprtc.VIDEOCODEC': 'VP8',
       'org.appspot.apprtc.CAPTURETOTEXTURE': False,
@@ skipping 27 matching lines @@
 
   if videooutsave:
     time.sleep(2)
 
     subprocess.check_call(['adb', '-s', devname, 'pull',
         videoout, videooutsave])
 
 if __name__ == '__main__':
   main()