Unreviwed rebaselining for a couple of webaudio tests

Since we've switched to double-precision for times in AudioParam methods,
some .wav baselines are now slightly different
https://codereview.chromium.org/18456002/

BUG=none
TBR=crogers@google.com

Review URL: https://codereview.chromium.org/19280003

git-svn-id: svn://svn.chromium.org/blink/trunk@154251 bbb929c8-8fbe-4397-9dbb-9b2b20218538