Replace av_malloc with AlignedAlloc for memory allocation in DecoderBuffer.

BUG=150920,145551
TEST=media_unittests


Review URL: https://chromiumcodereview.appspot.com/10949029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@157836 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed