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Inspectable views can have any url, including some maddeningly long
ones. We need to ensure that these render appropriately on the
extension's card in the main view of the chrome://extensions page.
Make the following changes:
- Ensure that the inspect views section does not grow beyond the
  content area.
- Ensure that the "Inspect views" and "n more..." are always visible
- Adjust the overflow for the shown inspectable view to be hidden
  behind ellipses, and have the title text have the full label.

Bug: 789655

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Icb6b769ed96c5775ea34a62eb15b89dbf625d124
Reviewed-on: https://chromium-review.googlesource.com/802095
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521601}