Fix two test cases for WebMessaging message clone

[siusin]

Logical errors in the code. FF and IE will pass after the fix.

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[zcorpan]

w3c-test:mirror

[AFBarstow]

@siusin @zcorpan thanks for this! FYI, when I run these two tests on FF34 and Opera12.16, I now get passes for the array and object tests (they previously failed [1]). However, for Chrome39.0, the array test still fails (both with and without ports). Thought you might want to know.

[1] http://w3c.github.io/test-results/webmessaging/less-than-2.html

[siusin]

@AFBarstow That's great! There are only 6 failures left in the report now.

I think Chrome failed because their output for the structure clone(HTML5 Ch2.7.5) of an array is an indexed array obj, while this test case is expecting a simple array.