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This file was leftover from a time when there were separate
implementations for Mac-Views vs other-platforms-views, which is no
longer the case. Move the methods from this file into the main .cc file.

Note: Technically, we could also move the header and implementation from
c/b/ui/extensions/extension_message_bubble_browsertest.* and collapse
everything into c/b/ui/views/extension_message_bubble_view_browsertest;
this separation pre-dates Mac-Views, and was designed to share code
between c/b/ui/views and c/b/ui/cocoa implementations. However, that's a
lot more code churn. Start here.

Bug: None
Change-Id: I98eca6c92ccfa03a50090558c30ecc84e2652828
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392697Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804435}