The news today regarding Google's Chrome web-browser, and the open-source Chromium version, is that it finally supports PulseAudio. As of yesterday, PulseAudio sound playback support on Linux was committed to Chromium trunk. It's a preliminary implementation of a PulseAudio sound back-end. Current limitations is that it's stereo audio only right now and that PulseAudio is not yet dynanically linking PulseAudio at run-time if it's available.
Confirmation of PulseAudio support finally coming to Google's web-browser can be found in this bug report.
It's pleasant to see the support of PulseAudio finally, which will hopefully lead to a better web-browser audio experience for most modern Linux distributions that use this open-source audio library, compared to Chrome talking directly to ALSA.