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This is the 'width' version of
https://chromium-review.googlesource.com/c/chromium/src/+/2462574

min-width:auto had been using the image's intrinsic widths as the
content size suggestion, as returned by image_node.ComputeMinMaxSizes().
But that function honors specified min/main/max widths and the content
size suggestion is supposed to ignore those.

Now content size suggestion ignores specified width properties and also
honors the transferred size -- if the specified height is definite, we
pass it through the aspect ratio to determine the content size suggested
width.

Change-Id: I74ed9d96e584605ad8154cc9cb5a94ef84f78544
Bug: 1132627
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500448Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Commit-Queue: David Grogan <dgrogan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821309}