Remove a bunch of cruft from //build.

build/check_return_value.py

Index: build/check_return_value.py
diff --git a/build/check_return_value.py b/build/check_return_value.py
deleted file mode 100755
index c659d1e9674ab96af49c3fb2dea8b061ecef162a..0000000000000000000000000000000000000000
--- a/build/check_return_value.py
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/env python
-# Copyright 2014 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.
-
-"""This program wraps an arbitrary command and prints "1" if the command ran
-successfully."""
-
-import os
-import subprocess
-import sys
-
-devnull = open(os.devnull, 'wb')
-if not subprocess.call(sys.argv[1:], stdout=devnull, stderr=devnull):
-  print 1
-else:
-  print 0