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Also adds a browsertest for CrostiniUninstallerView.

Bug: 849438
Change-Id: I13ff94ec9324be0c01757f3094d76403c1d3b30f
Reviewed-on: https://chromium-review.googlesource.com/1092397
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566758}