Convert editing/style/relative-font-size-change-00[1-4].html to use w3c test harness
This patch converts "editing/style/relative-font-size-change-00[1-4].html" to
use w3c test harness and integrates into "relative_font_size_change.html", since
both test cases are very similar, to simplify test script for improving
readability.
BUG=n/a
TEST=n/a; no behavior changes
Committed:
https://crrev.com/25cb7a2c691f668be41ea6ba5dcfe77313a9bd8a
Cr-Commit-Position: refs/heads/master@{#412487}