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Refactor LocationBarView to move Refresh logic for some BubbleIconViews into the respective subclasses.

This is initial work for adding BubbleIconViews to Chrome OS Desktop PWAs.
It partially decouples BubbleIconViews from the LocationBarView so that
they can also be used in HostedAppButtonContainer.

Bug: 788051
Change-Id: I986951b64fb02f2d2728abbe6a3964ff97e04909
Reviewed-on: https://chromium-review.googlesource.com/923607
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542045}