Fix crash in blink::DOMWindowEventQueue::close

BUG=395991
R=yurys, pfeldman@chromium.org

Review URL: https://codereview.chromium.org/453943003

git-svn-id: svn://svn.chromium.org/blink/trunk@179929 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Patch creates an experimental item in context menu which will be used for documentation.

BUG=391593

Review URL: https://codereview.chromium.org/452083002

git-svn-id: svn://svn.chromium.org/blink/trunk@179930 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Prepare moving AsyncCallChain to Oilpan

BUG=340522

Review URL: https://codereview.chromium.org/413113003

git-svn-id: svn://svn.chromium.org/blink/trunk@179931 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert 179931 "Oilpan: Prepare moving AsyncCallChain to Oilpan"

> Oilpan: Prepare moving AsyncCallChain to Oilpan
> 
> BUG=340522
> 
> Review URL: https://codereview.chromium.org/413113003

TBR=keishi@chromium.org

Review URL: https://codereview.chromium.org/458163002

git-svn-id: svn://svn.chromium.org/blink/trunk@179932 bbb929c8-8fbe-4397-9dbb-9b2b20218538