Fix crash in reading audio capture device name. Relevant crash report: http://crash/reportdetail?reportid=c48906f8d604a9d5#crashing_thread
Fix crash in reading audio capture device name.
Relevant crash report: http://crash/reportdetail?reportid=c48906f8d604a9d5#crashing_thread

BUG=69608
TEST=none

Review URL: http://codereview.chromium.org/6333005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@71434 0039d316-1c4b-4281-b951-d872f2087c98

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