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Currently, ExtensionMessageBubbleBrowserTest inherits from
BrowserActionsBarBrowserTest. Unfortunately, this means that none of
these tests run with the new Extensions Menu UI. Since the
BrowserActionsBar-related tests are going away, we need to migrate these
to be compatible with the new UI.

Instead of inheriting from BrowserActionsBarBrowserTest, inherit from
ExtensionBrowserTest directly. There were relatively few dependencies,
and this paves the way to having these tests run with the new UI.

Bug: 1100412
Change-Id: I43cd5852ddf2e04eaee7c55f1d0b4086e31c59fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392702
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804491}