LD_LIBRARY_PATH needs to be set for media tests that uses FFmpeg to work properly.
LD_LIBRARY_PATH needs to be set for media tests that uses FFmpeg to work properly.

BUG=16945
TEST=test_shell_tests --gtest_filter=MediaLeakTest.*

Review URL: http://codereview.chromium.org/159386

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@21756 0039d316-1c4b-4281-b951-d872f2087c98

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