Move most of the [Pass]RefPtr's of CSSPrimitiveValue to our transition types.

I still need to move the CSSPrimitiveValues referred from the classes

. Pair
. Counter
. CSSBasicShape and subclasses
. CSSCalcExpressionNode and subclasses
. RectBase and subclasses

Instead of using Persistents I plan on moving the objects to the oilpan heap.
I also added a TraceTrait for RefPtr to compile trace method bodies in non-oilpan mode when tracing collections.
Finally I changed RawPtr's release() to zero out the m_ptr to match RefPtr's version.

R=ager@chromium.org, erik.corry@gmail.com, haraken@chromium.org, jochen@chromium.org, tkent@chromium.org, vegorov@chromium.org, zerny@chromium.org
BUG=341815

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=167022

Review URL: https://codereview.chromium.org/148523016

git-svn-id: svn://svn.chromium.org/blink/trunk@167089 bbb929c8-8fbe-4397-9dbb-9b2b20218538