Move StyleInheritedData.cpp to be inline in StyleInheritedData.h.

This patch removes StyleInheritedData.cpp, and moves all its contents to be
inline in StyleInheritedData.h

This is prework for generating StyleInheritedData.

BUG=628043

Review-Url: https://codereview.chromium.org/2883803002
Cr-Commit-Position: refs/heads/master@{#471691}
3 files changed