Use base::RefCountedData<WTF::Vector<>> for |exclusions_| from NGExclusionSpaceInternal

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

Bug: 955618
Change-Id: I9328743e64bb5e21e952e98da9dc9e317d9f89af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1583033
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#653948}
2 files changed