GitLab

unit_tests do not have prefs, but branded builds on Chrome OS attempt to read
the brand code out of a null g_browser_process->local_state().

Instead, we now return an empty brand code in tests.

This reduces the number of crashing unit_tests on the official builders from
~300 to ~30.

BUG=430266

Review URL: https://codereview.chromium.org/703623005

Cr-Commit-Position: refs/heads/master@{#302733}