Revert 244233 "Add support for using expressions as enum values."

> Add support for using expressions as enum values.
> 
> BUG=320090
> R=darin@chromium.org
> 
> Review URL: https://codereview.chromium.org/130443003

Broke the android build: http://build.chromium.org/p/chromium.linux/buildstatus?builder=Android%20Builder%20%28dbg%29&number=50248

TBR=mpcomplete@google.com

Review URL: https://codereview.chromium.org/133843004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244237 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244237