Remove html_individual_config and refactor groups out to separate test
files. The 'history' group of tests was never being run due to its name,
so 'popstateevent' introduces a new failure, although it isn't actually
new.
Change-Id: I8569ab7f8a47cd0ea60901da2afa296c9593631f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/138241
Commit-Queue: Srujan Gaddam <srujzs@google.com>
Reviewed-by: Bob Nystrom <rnystrom@google.com>