Fix test.py for Python 2.7.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9695053
Patch from Bert Belder <bertbelder@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11033 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/test.py

@@ -472,7 +472,7 @@ def RunProcess(context, timeout, args, **rest):
   popen_args = args
   prev_error_mode = SEM_INVALID_VALUE
   if utils.IsWindows():
-    popen_args = '"' + subprocess.list2cmdline(args) + '"'
+    popen_args = subprocess.list2cmdline(args)
     if context.suppress_dialogs:
       # Try to change the error mode to avoid dialogs on fatal errors. Don't
       # touch any existing error mode flags by merging the existing error mode.