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This new method will be used to determine if the user is likely
using Chrome as the default Browser for metrics logging
and when to present default browser promotional UI.

Bug: 1107489
Change-Id: I642a7de704f84c7564aea08d90a512cf08a1078a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348207Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Auto-Submit: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797499}