Move utility functions for sample rate to AudioUtilities.

isSampleRateRangeGood() -> isValidAudioBufferSampleRate()
minAllowedSampleRate() -> minAudioBufferSampleRate()
maxAllowedSampleRate() -> maxAudioBufferSampleRate()

These functions have been moved to AudioUtilities.
Some const values were used in some files sporadically instead of them.
Make these functions using every places.

BUG=413244

Review URL: https://codereview.chromium.org/565643003

git-svn-id: svn://svn.chromium.org/blink/trunk@181947 bbb929c8-8fbe-4397-9dbb-9b2b20218538