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Previously, adding a new feature to feature policy needs to modify
3 files:
- feature_policy_feature.mojom
- feature_policy_features.json5
- feature_policy.cc

This CL generates |FeaturePolicy::GetDefaultFeatureList| from json5
config, which eliminates the need to modify feature_policy.cc when
adding a new feature.

Change-Id: I368215bc66fa8b568e20203f7e9810ddd13f683f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212794Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Charlie Hu <chenleihu@google.com>
Cr-Commit-Position: refs/heads/master@{#789494}