Now that MediaErrors.h has errors for some of the conditions we were using custom error codes for previously, we should switch to using the standard error codes in order to get better error reporting to the app. Bug: 8621516 This is a merge of https://widevine-internal-review.googlesource.com/#/c/5040/ from widevine cdm repo to android repo. Change-Id: I111a8825fa8fd8186a0d535cf19a7b08d9f35aee