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Since the (CSS) parser allows numeric weight values in the range
[1, 1000], adjust the ranges in FontDescription::Lighter/BolderWeight
to match that.
Also factor in that the values can have fractions (by implicitly
truncating them) and simplify the range check since there's now a
set of adjacent intervals in practice.

Bug: 828747
Change-Id: I5fe3405ca45ed8016530d995976e36a6ebbcf366
Reviewed-on: https://chromium-review.googlesource.com/995452Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#548448}