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The code assumes if no browser exists for the profile where the signin
is happening then the sign in error is related to the user manager. The
previous assumption is not valid if the user decides to close the
profile while the user manager or another profile is open.  This CL
compares the profile path with |UserManager::GetSigninProfilePath| and
only in case of equality uses
|UserManagerProfileDialog::DisplayErrorMessage| to show the sign in
error.

Bug: 1132175
Change-Id: Icccdc44d3927d8750bea9957120d7fef6677c4aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435309
Commit-Queue: David Roger <droger@chromium.org>
Auto-Submit: Monica Basta <msalama@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814147}