Use base::RefCountedData<> for SVGDashArray

This CL replaces the type of SVGDashArray with
base::RefCountedData<WTF::Vector<Length>> from RefVector<Length>
to avoid using RefVector.

Bug: 955618
Change-Id: I00fe7db4e700657f5f64c9811678d361e8a4d6d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1580694
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#653551}
12 files changed