Clean up StyleInheritedData.

In preparation to generate StyleInheritedData, this patch removes the
StyleInherited destructor and copy constructor, since they are generated
by the compiler anyway.

BUG=628043

Review-Url: https://codereview.chromium.org/2880173002
Cr-Commit-Position: refs/heads/master@{#471672}
2 files changed