Move StyleRareInheritedData accessors to be inline in ComputedStyle.

Currently, ComputedStyle has getters and setters to some members in
StyleRareInheritedData. These getters and setters simply delegate to
getters and setters on StyleRareInheritedData. When we generate
StyleRareInheritedData, the generator does not generate these
getters and setters. Hence, this patch simply moves these accessors to
be inline in the getters/setters in ComputedStyle.

This is preparation for generating StyleRareInheritedData.

BUG=628043

Review-Url: https://codereview.chromium.org/2871463002
Cr-Commit-Position: refs/heads/master@{#471223}
3 files changed