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|FeaturePolicyFeature::kAccessibilityEvent| appears in
feature_policy_feature.mojom but is missing in
feature_policy_features.json5.

The original owner(dmazzoni@) who added the feature agreed
that it can be removed for now.

Change-Id: Ica187050353607e79e4b29027efc256f188b2e35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250340Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Charlie Hu <chenleihu@google.com>
Cr-Commit-Position: refs/heads/master@{#780027}