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The object-fit: scale-down property requires that the image be
sized to the smaller of "none" or "contain". When a srcset is used,
the IntrinsicSize of the image is scaled such that the srcset fills
the expected area. This causes scale-down to consider the intrinsic
size to be bigger than the actual image, and size things too large.

This change modifies the intrinsic size for content-fit: scale-down
in LayoutReplaced::ComputeObjectFit to un-apply the
ImageDevicePixelRatio, that is the scale that resized the src.

Chrome's behavior now matches Firefox.

BUG=818630

Change-Id: Ifbd63bbd6d905673e8058b49173b604cd9c8083e
Reviewed-on: https://chromium-review.googlesource.com/957131
Commit-Queue: Stephen Chenney <schenney@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543082}