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This change renames all remaining variables & updates all remaining
strings describing the master_preferences file except for strings/
variables/comments that are describing the filename on disk, which
remains unchanged. The next step in this work is to add support for
a new "initial_preferences" file, then deprecate support for the old
"master_preferences" file.

Bug: 1097209
Change-Id: I98ab16002669346239e9b7642302ad832429c3e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2551281Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830243}