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This CL changes new profiles created by signin interception to use the
generic avatar instead of a random avatar.

Bug: 1076880
Change-Id: I54a9481db74e9672250e1e4c3436fb723be130de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353338
Commit-Queue: David Roger <droger@chromium.org>
Reviewed-by: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799109}