Clean up the individual invalidation tests to be self contained.

This patch cleans up the individual invalidation tests to always call
next() directly instead of relying on the previous test to call
invokeAsyncWithTimeline.

BUG=410701

Review URL: https://codereview.chromium.org/674963003

git-svn-id: svn://svn.chromium.org/blink/trunk@184304 bbb929c8-8fbe-4397-9dbb-9b2b20218538