Demonstrate that Web Audio does not keep callbacks alive long enough.

LayoutTests/webaudio/scriptprocessornode-premature-death-expected.txt

Index: LayoutTests/webaudio/scriptprocessornode-premature-death-expected.txt
diff --git a/LayoutTests/webaudio/scriptprocessornode-premature-death-expected.txt b/LayoutTests/webaudio/scriptprocessornode-premature-death-expected.txt
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+Tests that a script processor node is not prematurely GCed
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Testing with explicitly keeping a reference to the script processor node alive.
+PASS wasCollectedPrematurely is false
+PASS wasCalled is true
+Testing without explicitly keeping a reference to the script processor node alive.
+FAIL wasCollectedPrematurely should be false. Was true.
+FAIL wasCalled should be true. Was false.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+