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Refactor setting of blink runtime flags from content: Part 3

- Consolidate baseFeature checks together and use enums
  to denote 3 common use patterns

Design docs: https://docs.google.com/document/d/1d6_NBVPXh7B2XMk3H9b_qIxeuSXq6MblVSJldN7bTBY/edit?usp=sharing

Bug: 832393
Change-Id: If3b4e4d80c61ab810014550c6aedf873768d1fa5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826862
Commit-Queue: Rodney Ding <rodneyding@google.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Jason Chase <chasej@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706479}