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Rename TrayDetailsView::InfoLabel to TrayInfoLabel and moved it to its own file. It also now subclasses ActionableView instead of View, so it can be clickable. TrayInfoLabel::Delegate keeps track of whether or not the label is clickable, and handles clicks.

Reland of https://codereview.chromium.org/2957043002/

This reverts commit fc8ab64a.

Bug: 672263, 735642, 740671
Change-Id: I7957bc934e01e226ee588939a21d1fc4afc0bdb3
Reviewed-on: https://chromium-review.googlesource.com/578142
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488263}