Revert of [screen-orientation] Update implementation to match recent spec changes. (https://codereview.chromium.org/374623002/)

Reason for revert:
Causing content_browsertests failure on Android: http://build.chromium.org/p/chromium.webkit/builders/Android%20Tests%20%28dbg%29/builds/20086/steps/content_browsertests

Original issue's description:
> [screen-orientation] Update implementation to match recent spec changes.
> 
> https://github.com/w3c/screen-orientation/pull/21
> 
> BUG=162827
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=177734

TBR=abarth@chromium.org,ager@chromium.org,mlamouri@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=162827

Review URL: https://codereview.chromium.org/381753002

git-svn-id: svn://svn.chromium.org/blink/trunk@177763 bbb929c8-8fbe-4397-9dbb-9b2b20218538