Remove SVGDocumentExtensions::IsSVGRootWithRelativeLengthDescendents

It's not used.

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: If6630b2e404108044833ea5512151facdfe7e59d
Reviewed-on: https://chromium-review.googlesource.com/1179760
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#584061}
2 files changed