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The MessageView renders a drop shadow[1] on Windows that adds insets to
the content view of notifications. We need to set the reduced width as
size of the |message_view_| to correctly calculate bounds and wrapping
behavior.

Before: https://imgur.com/pftjgrG
After: https://imgur.com/wEsv5EN

[1]: https://cs.chromium.org/chromium/src/ui/message_center/views/message_view.cc?l=107&rcl=2b3975c5de2635f5a436fb950b42fd5b657ae09f

Bug: 1001047
Change-Id: I8a8b75aea4bdb800596d7790fafa541f2b50a6e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895333Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712962}