[quickview] Clear the metadata box content during init()

Init the metadata box visual content to a known state (clear) when the
metadata box controller init() method is called.

Bug: 965370
Change-Id: Ie3de4dd1f6dd033ccad553407c2c8f5135625160
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1687332
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#674958}
1 file changed