Revert "Use srcset's resource pixel density to determine intrinsic size"

This reverts commit 19573e3ba923b24aafb8c8d27238b18b15ed13bb.

Revert "Auto-rebaseline for r159544"

This reverts commit e55dffd2e7d6ed4fbb26d8a9fe89a67d595d7673.

Crashing linux_layout.

TBR=yoav@yoav.ws
BUG=299556
NOTRY=true

Review URL: https://codereview.chromium.org/27142003

git-svn-id: svn://svn.chromium.org/blink/trunk@159553 bbb929c8-8fbe-4397-9dbb-9b2b20218538