Fixes crash in AudioInputVolumeTest.InputVolumeTest.
Fixes crash in AudioInputVolumeTest.InputVolumeTest.

My CL  https://codereview.chromium.org/15563004 broke this test.

http://build.chromium.org/p/chromium.memory.fyi/
Failure notification for "memory test: media" on "Chromium Mac (valgrind)(1)".
Please see if the failures are related to your commit and take appropriate actions (e.g. revert, update suppressions, notify sheriff, etc.).

http://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20Mac%20%28valgrind%29%281%29/builds/20942

Revision: 202536, 202537, 202538, 202540, 202541, 202542
Blame list: eseidel@chromium.org,glider@chromium.org,henrika@chromium.org,kinuko@chromium.org,mtomasz@chromium.org,tzik@chromium.org

BUG=see details above
TEST=media_unittests --gtest_filter=AudioInputVolumeTest.InputVolumeTest* in Debug mode on device with audio hardware
R=xians@chromium.org

Review URL: https://codereview.chromium.org/15688007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@202557 0039d316-1c4b-4281-b951-d872f2087c98

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