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The MatchFieldTypes enum starts at 1<<2 instead of 1<<0 temporarily.
Since the lowest two bits are used nowhere at the moment, and
MatchFieldTypes will be shifted to the right once the PatternProvider
is launched, we can shift the values in the JSON to the right, and
shift them to the left only at load time in order to match the
MatchFieldTypes enum.

This CL also changes the compression algorithm from gzip to brotli,
which saves about 18% space.

Bug: 1140775
Change-Id: I171d4b67391da7b7934993fd7611a8acecce7fdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489080Reviewed-by: Matthias Körber <koerber@google.com>
Commit-Queue: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/master@{#820795}