Pepper: Make C++ wrappers for PPB_AudioConfig backwards compatible.
Pepper: Make C++ wrappers for PPB_AudioConfig backwards compatible.

This makes the wrappers work transparently with both versions 1.1 and 1.0 of the
interface.

(The compatibility is needed for Pepper Flash to use the wrappers; Pepper Flash
needs to work with M18 until M19 ships, at which point we can remove the
1.0-compatibility.)


Review URL: http://codereview.chromium.org/9617018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@125310 0039d316-1c4b-4281-b951-d872f2087c98

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