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Form digest was not aware of real url, that led that matched forms were not
proceed correctly. This CL fix issue and add test. Test for other
WebsiteLoginManager methods will be added in separate CL.

Bug: 1090286
Change-Id: I910b02d4ddd82e213eb3baaceb5f055a1d9b36f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2267078
Commit-Queue: Milica Selakovic <selakovic@google.com>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783030}