Devirtualize Biquad's destructor
Devirtualize Biquad's destructor

Devirtualize Biquad's destructor as this class is never subclassed, nor does it
have any virtual function. This avoids creating an unnecessary vtable.

BUG=311561

Review URL: https://codereview.chromium.org/45143002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160630 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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