IDL compiler: [SetterCallWith], [SetterRaisesException] (test stubs only)

Just stub test cases, since setters not implemented.
(I.e., asserts nop for getters.)

BUG=239771
NOTRY=true

Review URL: https://codereview.chromium.org/27469002

git-svn-id: svn://svn.chromium.org/blink/trunk@159741 bbb929c8-8fbe-4397-9dbb-9b2b20218538