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Further, use the empty string for the email rather than
"anonymous_user", since the listnr UI treats an empty email field
specially and recognizes the report as being anonymous, but does not do
so for the string "anonymous_user".

BUG=chromium:1112012
TEST=browser tests and component tests
TEST=sent two feedback reports; one with email set and one without

Change-Id: I3fa1341151a8daae82a39d8b47b1276d6a7c1721
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335891
Commit-Queue: Miriam Zimmerman <mutexlox@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Ian Barkley-Yeung <iby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795285}