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When deriving the content size suggestion we need to account for the
aspect ratio and any definite cross axis size. In the code that does
this we were using the flex basis instead of the cross axis size.

This fixes two tests that were marked as failing.

Change-Id: Ifcdd57434944f884a5c6b1c0dae68efa7e1bba6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490227Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Commit-Queue: David Grogan <dgrogan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820522}