Remove reference to RareNonInheritedData and subgroups from ComputedStyle

This patch generates the diff functions for subgroups on
RareNonInheritedData. It also removes references to groups in
ComputedStyle.cpp

Diff: https://gist.github.com/nainar/5181b6dbbd7181cffc869a359b57b96a/revisions

Bug: 710938
Change-Id: If9030a551b375cbe35caf486a838e29d31950f4c
Reviewed-on: https://chromium-review.googlesource.com/542997
Commit-Queue: nainar <nainar@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481445}
4 files changed