Do not change pageshow event behavior though it does not follow spec
Do not change pageshow event behavior though it does not follow spec

As per spec step of history traversal algorithm (section 7.6.10): subsection 4.6 of 
http://www.whatwg.org/specs/web-apps/current-work/multipage/history.html#traverse-the-history 
browser should queue a task to fire pageshow event. However chrome and other desktop browsers 
firefox30 and IE11) dispatches the event sync right after onload is triggered. 
Specification change requested for the same so just update the same in comments comments. 

BUG=378946

Review URL: https://codereview.chromium.org/294663007

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@175311 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs