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Installs the BrowserSignin policy handler by default. It was previously
hidden behind the --install-browser-signin-handler command-line flag
while the different parts of the implementation were being finished. The
policy now fully works, so the command-line flag is no longer needed.

Bug: 1155745
Change-Id: I58dda5bdc143cbfbd21cecbea13d184bc60100ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2633352Reviewed-by: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#844766}