Move parseInt parseDouble to int/double classes as a static method.
Move parseInt parseDouble to int/double classes as a static method.

Remove math dependency from core/coreimpl in dart2js.
The existing Math.parseInt and Math.parseDouble are kept *for now*, but
simply redirect to the static methods.
They will be removed in time (when library code is ready for it).

Review URL: https://codereview.chromium.org//10913271

git-svn-id: a8f079e7cfc3a289d8496d7b88aabbd5c45a3053@12417 260f80e4-7a28-3924-810f-c04153c831b5

astashov/intl,dart-lang/intl,astashov/intl