Intorudce DECLARE/DEFINE_ELEMENT_FACTORY_WITH_TAGNAME macros.

Introduce DECLARE/DEFINE_ELEMENT_FACTORY_WITH_TAGNAME macros.

They generate Element factory function like |PassRefPtrWillBeRawPtr<T>
create(const QualifiedName&, Document&)|.

We're going to change element factories at least twice.
 1. Replace adoptRefWillBeRefCountedGarbageCollected with adoptRefWillBeNoop
 2-1. Replace PassRefPtrWillBeRawPtr<T> with T* and remove adoptRefWillBeNoop if
   we switch to Oilpan successfully.
 2-2. Replace PassRefPtrWillBeRawPtr<T> with PassRefPtr<T>, and
   adoptRefWillBeNoop with adoptRef if we decide not to switch Oilpan.

This CL makes these changes easier.

BUG=357163
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175940

[tkent, 2014-06-11 00:44:45]

Please review this.
This is similar to https://codereview.chromium.org/327633004/

[haraken, 2014-06-11 00:48:26]

LGTM

[tkent, 2014-06-11 01:21:13]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-06-11 01:21:32]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tkent@chromium.org/327133002/20001

[commit-bot: I haz the power, 2014-06-11 02:44:42]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/1...)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/11524)

[commit-bot: I haz the power, 2014-06-11 03:52:15]

Change committed as 175940