The disk store has not been written to since MetaMask v4.3.0, as it was
removed in #3083. It was kept around so that anything written to disk
prior to v4.3.0 could still be restored.
It has been a year and a half since that release, so I think it's time
to remove the disk store altogether. The consequences of losing locally
stored data are small anyway - it's an inconvenience at worst.
The AbortController is used in both the background and the UI. Support
for AbortController was added to Chrome in version 66, which is above
our minimum supported version.
I did consider increasing the minimum Chrome version to 66, but we have
a decent number of users still on Chrome 65 unfortunately.
* Nix notification for Share Address
* Add Connections settings tab in place of privacy mode toggle
* Split ProviderApprovalController into two stores
* Remove privacyMode feature flag altogether
* Add migration to remove privacyMode feature flag
`seedWords` used to be stored on the metamask state temporarily at
certain points. This hasn't been the case since #5994, but references
to this state remained. All of the logic remained for correctly updating
these `seedWords`, handling them during navigation, and scrubbing them
from the state.
However the state was never updated in practice. The `seedWords` are
still returned by `verifySeedPhrase`, and they're still stored in
component state in a few places. But they aren't ever set in the Redux
metadata state or the Preferences controller.
All references to this state have been removed, along with any logic
for interacting with this state. A few unused actions were removed as
well.