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password_manager::CredentialManagerClient was a RenderProcessObserver,
and sent messages via RenderThread. This couldn't possibly have ever
worked; the messages it sent were simply dropped on the floor.

After this patch, it's a RenderViewObserver and its messages
successfully land in the ChromePasswordManagerClient, just as they
ought to.

BUG=400674

Review URL: https://codereview.chromium.org/533493004

Cr-Commit-Position: refs/heads/master@{#292932}