Revert 226264 "Be able to build cast_unittest and related target..."

This patch was causing the Mac bot build to fail.

> Be able to build cast_unittest and related targets in Chrome tree
> 
> Adding cast.gyp to build/all.gyp. Also a bunch of chromium style errors.
> 
> Review URL: https://codereview.chromium.org/24586003

TBR=hclam@chromium.org

Review URL: https://codereview.chromium.org/25546003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226267 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226267