Revert 149449 - Add support for v0.3 of the encrypted WebM specification.

Asan didn't like this: http://build.chromium.org/p/chromium.memory/builders/Linux%20ASAN%20Tests%20%282%29/builds/414/steps/media_unittests/logs/stdio

- Added code to handle the signal_byte contained within WebM
  encrypted Blocks.
- Added a unittest to aes_decryptor to hanlde an encrypted WebM
  Block with an unencrypted frame.

BUG=139876
TEST=Run media_unittests  --gtest_filter=AesDecryptor* and all
     tests must pass.


Review URL: https://chromiumcodereview.appspot.com/10823110

TBR=fgalligan@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10831115

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149457 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed