Use the correct number of WaveOut buffers on XP...

Reverts a buffer size increase added in http://crrev.com/168111
and hacks added in http://crrev.com/169553

BUG=161307
TEST=Flash, HTML5 playback smoothly -- even in the background.

Review URL: https://chromiumcodereview.appspot.com/12155003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180102 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed