download_gold_plugin.py: Redirect stderr to /dev/null when calling gsutil.

build/download_gold_plugin.py

Index: build/download_gold_plugin.py
diff --git a/build/download_gold_plugin.py b/build/download_gold_plugin.py
index cd7ca41ed312fe7774b622d163a8700e366b0bde..e45430b9f601eb8fb822bb74b03fd33125c4ed1f 100755
--- a/build/download_gold_plugin.py
+++ b/build/download_gold_plugin.py
@@ -35,8 +35,13 @@ def main():
 
   os.chdir(LLVM_BUILD_PATH)
 
+  # TODO(pcc): Fix gsutil.py cp url file < /dev/null 2>&0
+  # (currently aborts with exit code 1,
+  # https://github.com/GoogleCloudPlatform/gsutil/issues/289) or change the
+  # stdin->stderr redirect in update.py to do something else (crbug.com/494442).
   subprocess.check_call(['python', GSUTIL_PATH,
-                         'cp', remote_path, targz_name])
+                         'cp', remote_path, targz_name],
+                        stderr=open('/dev/null', 'w'))
   subprocess.check_call(['tar', 'xzf', targz_name])
   os.remove(targz_name)
   return 0