Revert "Elements with no size are offscreen only if outside the screen."

This reverts commit a8671260ecea052b2abf090750d07035808d9665.

TBR=katydek@google.com,dmazzoni@chromium.org

Bug: 786621
Change-Id: I5429cafee92658626e826dd998404c3edc25918f
Reviewed-on: https://chromium-review.googlesource.com/778131
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517721}
9 files changed