Fix build warning

WARNING at build arg file (use "gn args <out_dir>" to edit):10:27: Build argument has no effect.
enable_one_click_signin = false
                          ^----
The variable "enable_one_click_signin" was set as a build argument
but never appeared in a declare_args() block in any buildfile.

To view all possible args, run "gn args --list <out_dir>"

The build continued as if that argument was unspecified.

Done. Made 18000 targets from 3088 files in 3670ms

_/ansible/plays/chromium.yml

@@ -257,7 +257,6 @@
           enable_keystone_registration_framework = false
           enable_linux_installer = false
           enable_media_remoting = false
-          enable_one_click_signin = false
           ffmpeg_branding = "Chrome"
           is_component_build = false
           is_debug = false