Revert of Add security checks to scheduled actions

Revert of Add security checks to scheduled actions (patchset #8 id:140001 of https://codereview.chromium.org/2702213004/ )

Reason for revert:
Doesn't take microtasks into account - will reland with fix

Original issue's description:
> Add security checks to scheduled actions
> 
> Scheduled actions end up generating code from strings, so we should put
> similar restrictions as for eval() in place
> 
> R=haraken@chromium.org,dcheng@chromium.org
> BUG=693695, 694446
> 
> Review-Url: https://codereview.chromium.org/2702213004
> Cr-Commit-Position: refs/heads/master@{#452016}
> Committed: https://chromium.googlesource.com/chromium/src/+/0ac9c3a4fbf57ad4cc2f954fc452fa62a729e0e1

TBR=dcheng@chromium.org,haraken@chromium.org,yukishiino@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=693695, 694446

[jochen (gone - plz use gerrit), 2017-02-23 18:22:24]

The CQ bit was checked by jochen@chromium.org

[jochen (gone - plz use gerrit), 2017-02-23 18:22:25]

Created Revert of Add security checks to scheduled actions

[commit-bot: I haz the power, 2017-02-23 18:23:19]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-23 18:27:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-02-23 18:27:04]

Try jobs failed on following builders:
  ios-device on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device/builds...)
  ios-device-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device-xcode-...)
  ios-simulator on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator/bui...)
  ios-simulator-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator-xco...)
  mac_chromium_compile_dbg_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[haraken, 2017-02-23 21:28:16]

LGTM