(Pre)Parser: Move ParsePrimaryExpression to ParserBase.

(Pre)Parser: Move ParsePrimaryExpression to ParserBase.

Notes:
- To be able to move the recursive descent functions to ParserBase one at a
time, we temporarily need routing functions from traits to Parser/PreParser,
since the recursive descent functions form a cyclic structure.
- PreParser used to always allow intrinsic syntax. After this CL, it depends on
allow_natives_syntax() which was already in ParserBase.
- This CL also decouples (Pre)ParserTraits better from (Pre)Parser, passing more
information as parameters, so that the Traits don't need to get it from
(Pre)Parser.
R=ulan@chromium.org
BUG=v8:3126
LOG=N

Committed: https://code.google.com/p/v8/source/detail?r=19374

[marja, 2014-02-14 09:45:48]

ulan, ptal

[ulan, 2014-02-14 11:17:38]

lgtm

[marja, 2014-02-14 11:24:36]

Committed patchset #6 manually as r19374 (presubmit successful).