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- experimental.accessibility.onVolumeChange

I run chrome/common/extensions/docs/build/build.py, but no documents about a11y was changed. So this CL doesn't include any changes of documents.

BUG=chromium-os:16592
TEST=call the APIs manually on chromium-os

Review URL: http://codereview.chromium.org/7708025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98948 0039d316-1c4b-4281-b951-d872f2087c98