Remove non-generated member 'm_emptyState' from ComputedStyle.

In a previous patch (crrev.com/2742263002), the member 'm_emptyState'
became generated in ComputedStyleBase. However, the original handwritten
'm_emptyState' was not removed from ComputedStyle due to a bad merge.

This patch removes the handwritten version which is unused.

BUG=628043

Review-Url: https://codereview.chromium.org/2761263002
Cr-Commit-Position: refs/heads/master@{#458577}
1 file changed