It looks like the Chromium dev team nixed GStreamer support long ago. For details, see this WontFix'ed Chromium bug starting at Comment 9 and further comments from other Chromium devs:http://code.google.com/p/chromium/issue ... d=32861#c9
"Thanks for sharing your concerns. I understand that support for pluggable codecs would be very cool, but it's in direct conflict with Chrome's security sandbox and goals. Dynamically loading and executing codecs at run-time is something the sandbox explicitly disallows. The alternative of loading all gstreamer codecs at start time hurts new tab/startup performance too much. Finally, support for gstreamer on Mac/Windows isn't quite at the level as it is on Linux, and writing three separate backends (DirectShow, QuickTime, gstreamer) would further complicate the implementation and provide inconsistent results across operating systems.
In summary, we really wanted Chrome to behave and run the same on all platforms and have all media playback happen inside the sandbox."
That means it's up to outside party Chromium modifiers to integrate GStreamer support if it's going to happen.