Make testAutoScroll independent of the scrolling element.
Under fully interoperable CSSOM view mode the scrolling element isn't
the body but the document element. Update the unit test to use
the scrollingElement property so that it works under either mode.
BUG=157855
Change-Id: I2ab3070b37d148754d4e6b70157b34d72ced1a45
Reviewed-on: https://chromium-review.googlesource.com/541518
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481192}1 file changed
