Fix android_build_commands.FileExistsOnDevice

build/android/pylib/android_commands.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Provides an interface to communicate with the device via the adb command.
 
 Assumes adb binary is currently on system path.
 """
 
 import collections
@@ skipping 997 matching lines @@
     Returns:
       True if the file exists, False otherwise.
     """
     assert '"' not in file_name, 'file_name cannot contain double quotes'
     status = self._adb.SendShellCommand(
         '\'test -f "%s"; echo $?\'' % (file_name))
     if not status[0].find('test: not found'):
       return int(status) == 0
 
     status = self._adb.SendShellCommand('ls "%s"' % (file_name))
-    if not status[0].find('No such file or directory'):
+    if status[0].find('No such file or directory') == -1:
       return True
 
     return False
 
   def RunMonkey(self, package_name, category=None, throttle=100, seed=None,
                 event_count=10000, verbosity=1, extra_args=''):
     """Runs monkey test for a given package.
 
     Args:
       package_name: Allowed package.
@@ skipping 17 matching lines @@
            ' '.join(['-c %s' % c for c in category]),
            '--throttle %d' % throttle,
            '-s %d' % seed,
            '-v ' * verbosity,
            '--monitor-native-crashes',
            '--kill-process-after-error',
            extra_args,
            '%d' % event_count]
     return self.RunShellCommand(' '.join(cmd),
                                 timeout_time=event_count*throttle*1.5)