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Use modules to load main class and browser proxy. Actually calls browser
proxy.

Bug: 1113981
Change-Id: Ia5df25c26c8e2131cab9663382680156e1304b75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497901
Commit-Queue: Bo Majewski <majewski@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821071}