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This CL adds the new assertion to audit; it checks if an array has
values other than the expected value. This is useful when checking
the non-zero array.

BUG=678695
TEST=
LayoutTests/webaudio/unit-tests/audit.html
LayoutTests/webaudio/unit-tests/audit-failures.html

Review-Url: https://codereview.chromium.org/2618053002
Cr-Commit-Position: refs/heads/master@{#442095}