Revert "Distinguish actions registered with setTimeout() and setInterval()."

This reverts https://src.chromium.org/viewvc/blink?view=rev&revision=154624

Reason: suspected as the cause of OOM crashes.

BUG=230705,263503
TBR=haraken

Review URL: https://codereview.chromium.org/20759003

git-svn-id: svn://svn.chromium.org/blink/trunk@155001 bbb929c8-8fbe-4397-9dbb-9b2b20218538