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This patch migrates the Blink CSS minifier to GRIT and applies it
whenever GRIT creates a CSS resource. This allows us to minify all
CSS resources in a unified and effortless manner.

As a result, this patch achieves 12k Android binary size reduction:

https://ci.chromium.org/p/chromium/builders/try/android-binary-size/368229

Bug: 1015410
Change-Id: Ief8efe57d26f2e26c3b53523d8c973d1d193d20b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900259Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713567}