Revert "Added additional invalidations for fixed background-attachments."

Speculative revert to fix SyncErrorNotifierTest.PassphraseNotification.
This reverts commit r173972. See bug for details.

BUG=372973
TBR=awoloszyn@chromium.org

Review URL: https://codereview.chromium.org/284963002

git-svn-id: svn://svn.chromium.org/blink/trunk@173987 bbb929c8-8fbe-4397-9dbb-9b2b20218538