Use generated copy and compare for OriginalDisplay in ComputedStyle.

The original_display_ field in ComputedStyle currently has generated
storage, but not copy and compare. This patch makes it use generated
copy and compare. Previously, 'has_custom_compare_and_copy' was set
to true, so the generator did not generate a compare and copy for
OriginalDisplay. By removing that line, we fall back to the default
value of false, which means the generator will now generate a
compare and copy.

This patch does not change behaviour, as the newly generated code is
the same as the code being removed.

Diff of generated files:
https://gist.github.com/darrnshn/942c8c2b4a5e42fe9b5c214388f0901f/revisions

BUG=628043

Review-Url: https://codereview.chromium.org/2831933003
Cr-Commit-Position: refs/heads/master@{#467818}
2 files changed