We can call less getters on node objects.

R=dgozman@chromium.org

Bug: chromium:799791
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Iecfe76c2be6b6bed675013ac4aaa117b714d4ba5
Reviewed-on: https://chromium-review.googlesource.com/854623Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50420}