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This CL also changes the expected behavior of GenerateKeyRequest() of CleryKey key system when init_data is null. Previously it returns MediaKeyException (from render side) or fires KeyError (from plugin side). Now it fires an empty KeyMessage regardless. In the future the spec should be clear about this.

BUG=163785
TEST=media Layout test; media_unittests; content_browsertests


Review URL: https://chromiumcodereview.appspot.com/11348365

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171081 0039d316-1c4b-4281-b951-d872f2087c98