tools/git-sync-deps: fix error in git syntax for changing origin

Error introduced in https://crrev.com/1475513004

NOTRY=true

Review URL: https://codereview.chromium.org/1646863002
diff --git a/tools/git-sync-deps b/tools/git-sync-deps
index c99ae91..e13ce88 100755
--- a/tools/git-sync-deps
+++ b/tools/git-sync-deps
@@ -144,7 +144,8 @@
 
   if 0 != subprocess.call(
       [git, 'checkout', '--quiet', checkoutable], cwd=directory):
-      subprocess.check_call([git, 'remote', 'set-url', repo], cwd=directory)
+      subprocess.check_call(
+          [git, 'remote', 'set-url', 'origin', repo], cwd=directory)
       subprocess.check_call([git, 'fetch', '--quiet'], cwd=directory)
       subprocess.check_call([git, 'checkout', '--quiet'], cwd=directory)