Remove dead code in CSSValuePool.

drain() is unused. Its purpose was to clear the various caches in CSSValuePool.
So far it's not used anywhere so we should remove dead code. In the future if we want
to add cache clearing when memory is low we can just re-add this method.

Review URL: https://chromiumcodereview.appspot.com/16365009

git-svn-id: svn://svn.chromium.org/blink/trunk@151852 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed