Pass environment variable as string in autoroll script.

NOTRY=True
TBR=kjellander@webrtc.org

Bug: chromium:765231
Change-Id: I0121160ebd991815dd95dd6b145a68206be2d731
Reviewed-on: https://webrtc-review.googlesource.com/1844
Reviewed-by: Edward Lemur <ehmaldonado@webrtc.org>
Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19883}
diff --git a/tools_webrtc/autoroller/roll_deps.py b/tools_webrtc/autoroller/roll_deps.py
index 26e2e09..0b1279a 100755
--- a/tools_webrtc/autoroller/roll_deps.py
+++ b/tools_webrtc/autoroller/roll_deps.py
@@ -409,7 +409,7 @@
     if not skip_cq:
       logging.info('Sending the CL to the CQ...')
       cmd.extend(['--use-commit-queue', '--send-mail'])
-    _RunCommand(cmd, extra_env={'EDITOR': 'true', 'SKIP_GCE_AUTH_FOR_GIT': 1})
+    _RunCommand(cmd, extra_env={'EDITOR': 'true', 'SKIP_GCE_AUTH_FOR_GIT': '1'})
 
 
 def main():