Add TODO to deprecate ComputedStyle::operator==.

ComputedStyle::operator== excludes some data members in the comparison,
and it's not clear what members are compared and what are not. Ideally,
the equality operator would be replaced with a named method that better
describes which data members are compared.

BUG=628043

Review-Url: https://codereview.chromium.org/2740953003
Cr-Commit-Position: refs/heads/master@{#456177}
1 file changed