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Current string: Signed in as [email]. Manage your synced data on Google Dashboard
New strings: Signed in as [email]. Manage your synced data and devices on Chrome Dashboard

BUG=402615

Manual test:
launch chrome by chrome --force-fieldtrials="ChromeDashboard/Enabled/"
log in chrome, and then go to settings, on the top of settings, there should be the new string, click the "Chrome Dashboard", it should bring you to URL("https://google.com/settings/chrome/sync").

Review URL: https://codereview.chromium.org/998413003

Cr-Commit-Position: refs/heads/master@{#320941}