See here for more background: https://groups.google.com/a/google.com/forum/#!topic/chrome-signin/sRCl6-sxPzc
We should remove the "sign in to Chrome"/"sync" text from the embedded sign-in page (see here: https://screenshot.googleplex.com/1WEtaHMSMwi.png), and instead replace it with: "with your Google Account" (so the entire text should read "Sign in to Chrome / with your Google Account").
Per the email thread, we should add a new value for the flow parameter to indicate to GAIA that this body text should be changed.
Comment 1 by ew...@chromium.org
, Nov 15 2017