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Add some tests for disabling/enabling/uninstalling extensions from the
chrome://extensions page. Since we don't have any, these will help us determine
if we break anything during the transition to observing events from the
developerPrivate API.

BUG=461039

Review URL: https://codereview.chromium.org/1063863004

Cr-Commit-Position: refs/heads/master@{#324076}