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We draw our own shadows on Windows if aero glass is enabled. Those
shadows are drawn within the MessageView bounds, reducing the inner
available size by GetInsets(). We need to take that into account when
setting the preferred size of the header view, large image view and,
more importantly, when clipping the ink drop ripple for the inline
settings background.

Screenshots: https://imgur.com/2LLCkGj

Bug: None
Change-Id: I8167da9b6881e1f10384044e2035bcb87847b7e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2396338Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806936}