Remove BlobRegistry indirection since there is only one implementation.

BUG=

Review URL: https://chromiumcodereview.appspot.com/15851008

git-svn-id: svn://svn.chromium.org/blink/trunk@152746 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Unprefix CSS Variables

CSS Variables still have the -webkit prefix.
This CL removes the prefix.
Old format: -webkit-var-name: -webkit-var(otherName)
New format: var-name: var(otherName);

New test: fast/css/variables/prefix.html

BUG=244352

Review URL: https://chromiumcodereview.appspot.com/16183002

git-svn-id: svn://svn.chromium.org/blink/trunk@152747 bbb929c8-8fbe-4397-9dbb-9b2b20218538