Drop an obsolete TODO in profile_signin_confirmation_dialog.cc

The TODO is almost 4 years old, and suggests a change in behaviour which does
not even seem to have a bug assigned. The TODO's informational value is
questionnable at this point, and the code apparently serves its purpose without
the TODO being implemented.

Therefore this CL drops the TODO.

Referencing bug 171236, because the TODO was added in https://codereview.chromium.org/12221111, which is associated with that bug.

BUG=171236,543839

Review-Url: https://codereview.chromium.org/2453033005
Cr-Commit-Position: refs/heads/master@{#429579}
1 file changed