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Revert of Add a row in the network tray to inform users to turn Bluetooth on to enable Tether. (patchset #13 id:240001 of https://codereview.chromium.org/2957043002/ )

Reason for revert:
Broke compile on Linux ChromiumOS Builder (dbg), see https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Builder%20%28dbg%29

Original issue's description:
> Add a row in the network tray to inform users to turn Bluetooth on to enable Tether.
>
> Renamed 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.
>
> BUG=672263,735642
>
> Review-Url: https://codereview.chromium.org/2957043002
> Cr-Commit-Position: refs/heads/master@{#487975}
> Committed: https://chromium.googlesource.com/chromium/src/+/2257878a0dfb81bbbc37613752865983568580af

TBR=khorimoto@chromium.org,jamescook@chromium.org,lesliewatkins@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=672263,735642

Review-Url: https://codereview.chromium.org/2978363002
Cr-Commit-Position: refs/heads/master@{#488008}