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Refactor setting of blink runtime flags from content: Part 1

- Organize similarly controlled features together
- Break up large functions into smaller pieces
- Move all extra enable_experimental_features checks together

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

Bug: 832393
Change-Id: I8b8340b862e8556b6648b585fc75c1fdabcff18e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822978
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@{#701205}