[subprocess2] Replace VOID with DEVNULL

subprocess.DEVNULL was introduced in Python3 to serve same purpose
as subprocess2.VOID, so rename VOID to DEVNULL in subprocess2.

Change-Id: I6dade3306ffc3bc2441ac6083f362b099c2427e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2587758
Reviewed-by: Anthony Polito <apolito@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
diff --git a/git_common.py b/git_common.py
index 2bc1b5c..e8b3588 100644
--- a/git_common.py
+++ b/git_common.py
@@ -743,7 +743,7 @@
   stderr is dropped to avoid races if the process outputs to both stdout and
   stderr.
   """
-  kwargs.setdefault('stderr', subprocess2.VOID)
+  kwargs.setdefault('stderr', subprocess2.DEVNULL)
   kwargs.setdefault('stdout', subprocess2.PIPE)
   kwargs.setdefault('shell', False)
   cmd = (GIT_EXE, '-c', 'color.ui=never') + cmd
@@ -760,7 +760,7 @@
 
   Raises subprocess2.CalledProcessError on nonzero return code.
   """
-  kwargs.setdefault('stderr', subprocess2.VOID)
+  kwargs.setdefault('stderr', subprocess2.DEVNULL)
   kwargs.setdefault('stdout', subprocess2.PIPE)
   kwargs.setdefault('shell', False)
   cmd = (GIT_EXE, '-c', 'color.ui=never') + cmd