Rename StyleInheritedData members.

This patch renames:
- ComputedStyle::style_inherited_data_ -> ComputedStyle::inherited_data_
  (to be consistent with the other data refs like box_data_)
- Members of StyleInheritedData to have trailing underscore.

so that StyleInheritedData can be generated without name changes showing
up in the diff.

BUG=628043

Review-Url: https://codereview.chromium.org/2845463003
Cr-Commit-Position: refs/heads/master@{#467595}
4 files changed