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This CL avoids saving passwords when the user is signing in to Chrome
via the Desktop Identity Consistency flow. It basically avoids saving
password for URLs with origin "accounts.google.com" and that have
the URL parameter "ssp=1".

This CL also reverts https://chromium-review.googlesource.com/888623
which was a poor attempt to fix the same bug.

To review the code:
* Patch 1 is the revert of https://chromium-review.googlesource.com/888623
* Following patches contain the real fix.

Bug: 805826
Change-Id: I947b63cea5e2a875260fc9d6066eed696198e35f
Reviewed-on: https://chromium-review.googlesource.com/979932Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545789}