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In base::File, |file_| is a ScopedPlatformFile. So add constructors that
can take a ScopedPlatformFile directly, instead of having the caller
release the PlatformFile, and then rewrapping it.

Change-Id: Ie70cacc0a47263ff9ec5ce38f84032f1e469faa3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948195Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721736}